3*1.5x+9x=567000
    2400=-2x^2+480x-25600
    y =-0.5*120*120+80*120+4000
    x^-2/3
    （1000-2x)(100+x)=1152
    （40-4X）（25-2X）=3×200
    a×0.6=36.9
    a×0.6=28.9
    a×0.6=19.9
    a×0.6=10.9
    450/x-450/x+5 = 1
    （x+0.8)x=4.68
    381+X*7.93=(100+X)*4.05
    381+X*7.93=(100+X)*4.28
    381+X*7.93=(100+X)*0.428
    2x^2-x+2=0
    X/135-（100-X）/500=0.285
    X/135-（100-X）/1000=0.285
    [(4.5+x)/1.06-0.716]/0.65*0.35-0.7160=X
    [(4.5+x)/1.06-0.441]/0.7*0.3-0.441=X

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