X/（100+X）=10%
    142.86=0.92*x*(2*9.8(52.85-x))^0.5
    142.86=0.92*x*(2*9.8(32.7827-x))^0.5
    x＾3-4x^2+x+6=0
    （38.584+x）×2.8＝38.584+68.468-x
    0.7^x*0.3=0.9
    （38.584+x）×2.8＝38.584+68.468-x
    （38.584+x）×2.8＝38.584+68.468-x
    （38.584+x）×2.8＝38.584+68.468-x
    （38.584+x）×2.8＝38.584+68.468-x
    （38.584+x）×2.65＝38.584+68.468-x
    （38.584+x）×2.5＝38.584+68.468-x
    （38.584+x）×2.35＝38.584+68.468-x
    x＾3-3x^2+8x-6=0
    log5+logx=log(x-4)(x+2)
    x*(1-7%)=812650.47
    X/87-(95-X)/1000=0.21
    87/X-(95-X)/1000=0.21
    32.69*（1-x^16）/（1-x）=2564.7
    2a=3/2a-a

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