   7 
  
2017/9/4
                                            7                                                               =       30 ~ 40                   2          =       80 ~ 90     2          =       100 ~ 150                                                          2000 ~ 2500                                                                     20                   15                        0.8 =         40      2   40  ~50    1   50     0.5              3                                                                                                                                                 =   ÷                                                        20~30                                                                                                                                         =       -    0.2    -4      -4~-1       -1          45   70       45 -70   0.2 = -5                                                  D                                                                                                               = 205 -    = 220 -         70%        55%~ 69%        40%~54%                 = 170-     70         170 -70=100  /             170 -    0.9                                     a=       0.74    b =       0.082+34.89     =  a-b  ÷    100%          b =       0.082+44.74             17%~23%   20%~27%     25%   30 %                                                              14%~20%   17%~24%                        5%    15%                                                                   =  ÷             1.              2.              3.                                                                                                                                                  
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