（x-2）（x-3）=12
     [(x-400-2000*10%)*(1-25%)]/(6000+2000) = [(x-400-3000*15%)*(1-25%)]/(6000+1000)
     [(x-400-2000*10%)*(1-25%)]/(6000+2000) = [(x-400-3000*15%)*(1-25%)]/(6000+1000)
    [(x-400-2000*10%)*(1-25%)]/(6000+2000)=[(x-400-3000*15%)*(1-25%)]/(6000+1000)
    125x*x+150x-3
    1.26*√x+1.5x²=1
    1/(x+2)-1/(x+3)=1/(x+6)-1/(x+7)
    x+1=x
    2(x-5)(2x-1)(x-3)-(2x-5)(2x-1)(x-3)= 2(x-5)(2x-5)(x-3)- (2x-5)(2x-1)(x-5)
    2(x-5)(2x-1)(x-3)-(2x-5)(2x-1)(x-3)= 2(x-5)(2x-5)(x-3)- (2x-5)(2x-1)(x-5)
    sin（142.83*t+0.7954）=e^(140*t-4.25)
    5t^2-12t-28=0
    (2t)^2+(6-t)^2 = 8
    (2t)^2+(6-t)^2 = 8
    (2t)^2+(6-t)^2=8
    [(x-200)*(1-25%)]/3300=[(x-200-1500*10%)*(1-25%)]/3000
    x^3÷x^2=80.59
    16x^4-1552x^2+4225=0
    1.5－(5.5-x)×6＝2x
    e^i3.14159873/2

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