(10-x)(30＋5x)＝315
    (10-x)(30＋5x)
    x²-870x+105072
    x²-920x+66667＝0
    x²-920x+105072＝0
    x²-675x+77128＝0
    810-0.81x*x=110x
    58.8d^5-0.332d-0.10956=0
    15/131+X/126-(95-X)/1000=0.404
    x²+65.22x-160=0
    （2X-1）²=4X+9
    25x^2-30x-27＝0
    （1+2y）（1+2y）-3（1+2y）+2=0
    9（2x-1）（2x-1）-6（2x-1）+1=0
    (200+m)(50-1/5m)=10080
    (200+m)(50-1/5m)=10800
    （28-2x)(52-2x)=640
    x(40-2x）=150
    x(39-2x)=150
    238600000=x*79520*364+0.5*(7008*215-x*79520)*238

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