150*1.15
    100*50+160*30
    －x^(2)－2x+2
    （x+2）（x+2）＝0
    （x－2）（x－2）＝0
    2x^(2)－x－1＝0
    x^(2)－2x+1＝0
    3.1451=（20.095（x+0.1））/（1+1.5601（x+0.1））*（100-12.82-1.04）/100*1/(1+0.31*1.04)+（1.43（x+0.1））/（1.38*0.101325）
    3.1451=（20.095（x+0.1））/（1+1.5601（x+0.1））*（100-12.82-1.04）/100*1/(1+0.31*1.04)+（1.43（x+0.1））/（1.4*0.101325）
    ((0.1*16.3078*1.0574)/(1+0.1*1.0574))*((100-0.0999-0.0021)/100)*(1/(1+0.31*0.0021))+(2.24/1.31)
    ((0.1*16.3078*1.0574)/(1+0.1*1.0574))*((100-9.99-0.21)/100)*(1/(1+0.31*0.21))+(2.24/1.31)
    ((0.1*16.3078*1.0574)/(1+0.1*1.0574))*((100-0.0999-0.0021)/100)*(1/(1+0.31*0.21))
    ((0.1*16.3078*1.0574)/(1+0.1*1.0574))*((100-9.99-0.21)/100)*(1/(1+0.31*0.21))
    ((0.1*16.3078*1.0574)/(1+0.1*1.0574))*((100-9.99-0.21)/100)*(1/(1+0.31*0.21))+(2.24/1.35)
    ((0.1*16.3078*1.0574)/(1+0.1*1.0574))*((100-0.0999-0.0021)/100)*(1/(1+0.31*0.0021))+(2.24/1.35)
    ((0.1*20.7263*1.0053)/(1+0.1*1.0053))*((100-0.0537-0.0035)/100)*(1/(1+0.31*0.0035))+(2.26/1.35)
    ((0.1*20.7263*1.0053)/(1+0.1.0053))*((100-0.0537-0.0035)/100)*(1/(1+0.31*0.0035))+(2.26/1.35)
    42x3/2
    -3a-5=10
    5*x*x-12*x-9=0

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