x^3-2x+1=0
    x^4-6x^2-9=0
    50*10^3=0.14*1000*2/3*x
    50*10^6=0.14/6*1000*x*x
    （21x-7）*（1+1.16x）=2.16x
    0.162X^2+2X-1=0
    x^3+10x^2+27x+38＝0
    π^2x^4-64x^2+64=0
    p×p+2p×7÷10=32÷100
    y×y+2×0.577y=9÷30
    y×y+0.577×2y=8÷30
    x×x+2×0.577x=3÷30
    x×x+1.154x=0.2667
    29.54/（（707*8.07/100/7.07)^2+(707/100)*(1-707/7.07/100)^2)^0.5=x
    arctanx+arctan（x/7.07）=90
    x-912=4.13677*x^(2/3)
    x-650=3.6952*x^(2/3)
    180+arctan0.4-90-arctan10-arctan0.4-arctan0.2=x
    x^2+4.5x+1.75=0
    x=20000+500+2500+0.06*x/1.06+0.06*0.11*x/1.06+0.0003*x

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