1500(1+x)²=2940
    6(1+x)²=17.34
    2.5(1-n)²=1.6
    3x-180=x+760
    x^4+4x^3-x^2-8x+4=0
    （6-x）x=6
    -X^2+X-1
    （6-x）x=16
    x^2-6x-16=0
    x^5+10x^3+20x-4=0
    x（6-x）=8
    （32-x）*（20-x）=540
    2x^2-7x+1=0
    5.5/√h×(h－21)＝15
    （h-21）×√h＝5.5
    2x+4×（19-x）=44
     1.333*10^-8 = X^2+0.0137X
     1.333*10^-8 = a^2+0.0137a
    1.333*10^-8=X^2+0.0137X
    lnx＝x

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