256（1+x）²=400
    -x^1+36x-320=0
    x^6+2*x^5-2*x^3-4=0
    x²-256x=256(576-x)
    x+x*0.05=3500
    -2/1x-x＝3
    -2/1x-x
    -3/2x＝3
    -1/2x-x
    x/20+x/30+x/42=3
    x/20+x/30+x/42=3x
    tanx=x
    998.56=(1+0.25x^2)×(1+0.04x^2)
    1000=(1+0.25x^2)×(1+0.04x^2)
    2*sqrt（2）*sqrt（（2.5-x）*（2.5-x）+2）*(3-x)=sqrt（（2.5-x）*（2.5-x）+2）+3-x-1.5
    x=0.88x-30+258
    10000×(1+0.0625x^2)=x^4×(1+0.0001x^2)
    -12x²＋80x＋30=0
    （180-3x）x-（180-3x）20=1500
    36×(1+0.16x^2)=x^2×(1+0.04x^2)×(1+0.25x^2)×(1+0.0064x^2)

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