x^4-4x^3+4x^2-8x+4＝0
    98=6/（1+x）+100/（1+x）
    （100-2X）(80-x) =608
    8.72/2.18=x/2.47
    x²/1-x
    x^-13x-90=0
    e-x乘ex
    30000/(x+66)+10000/x=150
    0.1777142857142855x+0.007238095238095266=0.297
    0.1777142857142855x+0.007238095238095266=0.330
    0.1777142857142855x+0.007238095238095266=0.790
    x（30-3x）=63
    x（28-3x）=63
    x（26-2x）=63
    （10-a）（30+5a）=315
    300（x+1）（x+1）=432
    （16-x）(20+1/2x)=150
    （16-x）(20+1/2x)=460
    320/30*x+203/30*(x+15)+82/30(x+30)=1200
    260(lnx)^2+3628lnx+1848=0

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