125+20x=225-30x
    100+x²=（15-x）²
    100x+500=120x-630
    X²/0.1-X=0.00000000000794
    x^3+10x^2+25x+15=0
    （a+0.5）²＝240.25
    cosx＝0.2146
    x^2+0.00106x+0.0000689
    cosx＝0.21461038961
    0.0769（0.2-x）＝xx
    cosx＝0.21461038961
    x2+0.00106x+0.0000689
    X+2/5X+7=147
    x*x+2*x+2=0
    x*x+2*x-8=0
    X加2x/5 加7=147
    （0.5+x）x=1.8*10^(-5)(0.01-x)
    （0.5+x）x/(0.01-x)=1.8*10^(-5)
    （0.5+x）x/(0.01-x)=1.8*10^-5
    （0.25+x）x/(0.01-x)=1.8*10^-5

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