-x*(4-x)*(1-x)+4*(1-x)=0
    -x^3-6x^2-13x-10 = 0
    -x^3-6x^2+13x+42=0
    x^(2)-6x+4=0
    x*19.07+1/2*(-9.8)*x^2=-45
    1150 = 40/(1+r)+40/(1+2*r)+(40+1000)/(1+3*r)
    1150 = 40/(1+r)+40/(1+2r)+(40+1000)/(1+3r)
    x^2+165x-165*165=0
    x^2+163x-163*163=0
    x^3-8x^2-9x+36=0
    （5000×12×0.9−70%×130x×6.4%)÷(30%×130x+5%×130x)=3.8%
    cos(x)=0.3
    sina=5*10/144*cosa+0.21*cosa/10
    sina=5*10/256*cosa+0.21*cosa/10
    sina=5*16/256*cosa+0.21*cosa/16
    sin(a)=5*16/256*cosa+0.21*cosa/16
    sin(a)=5*16/256*cos(a)+0.21*cos(a)/16
    sin(a)=5*12/144*cos(a)+0.21*cos(a)/12
    cos(x)*20=6
    x^x^4=64

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