2*x*x*x+9*x*x+7.5*x+1.75=0
    x*x+x=240
    x*log(2,x)=0.0094
    10(x+x+1500)=65000
    10x+150+10x=xx +15x
    104-(x+3)÷4=90
    72(21-x)+72(21+x)=7(21-x)(21+x)
    x×tan(x)=3
    -25x+25=-12.5x+20
    8x-3*16%=48
    0.4344=0.137*Z^(-3)+0.119*Z^(-2)+0.269*Z^(-1)-0.019
    0.4344＝0.137Z^(-3)＋0.119Z^(-2)＋0.269Z^(-1)－0.019
    2*x*x*x+25*x*x+76*x-40=0
    1/x^2+32/x-32=0
    x^2+32x-32=0
    x^2-x-12
    -sinx+3x
    （x+0.8):（x-1.7）=5：3
    P=P/5*3
    （1+2x）^1/2

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