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
    (10+m)(500-20m)=6000
    40(1-x)^2=32.4
    0.55431-0.25*0.55431x∧2=1.25x
    hffggchchxigxgodoufztidoyxgixgiidgxgtidigzkgzkgdodkgzgjzkgzgkzkgdysyozgkzkhstid
    6p^2-40p+56=0
    32x^2-(8*32+2)x+16*32+1=0
    2t²-4t=1/2
    4X²-8X=1
    4t²-8t=1
    2X²-8X+9=0
    2X²+6=7X
    （X+1）²-4（X-2）²=0
    4（x+3）²=25（X-2）²

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