arctanx+arctan0.2x=π/2
    arctanx+arctan0.2x=90
    （x+3）(x-2)-（x+4）²
    （x+3）(x-2)-（x+4）2
    -3.2xx-14x=1.8
    50000×(1+x)^5+50000(1+x)^4+50000(1+x)^3=8496
    50000×(1+x)^5+50000×(1+x)^4+50000×(1+x)^3=8596
    5*(1+x)^5+5*(1+x)^4+5*(1+x)^3=8596
    2.5*(10331.0645-X)+1.25*(130064.23+X-103311.0645)+5.9*X+2.95*(66718.75-X)=4528447.7/12
    5-X=3
    6²+4t²=(8-t)²
    14X=(X+3.5)*9
    （2-x）²+(2x-4)²=32
    x^x*(ln(x)+1)=2
    4x²+26+x=0
    4y²+36=8-y
    6X-X=60
    （6X-X）=60
    (a+5)(a+7)=89999
    (5-x)(5-x)(2-x)

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