x∧2＋15x－900＝0
    6x×6+(6x+16)×6=7x×12
    x∧2＋15x－1500＝0
    2x^3+6x^2-18x-44=0
    4（k+4）^2-4（k-8）（k+2）=0
    2x^3+6x^-18x-44=0
    2x^3+6x^-18x-26=0
    3x^2+10x+4=0
    3x^4+16x^3+26x^2+16x=0
    x+x÷1.2=55
    tan（0.2x）＝x
    tan（0.2x）＝-x
    2(x+2)-5(x+2)=20-8(x+2)
    x/(240+x)=0.002
    4xxxx-8xxx-12xx+13x-3=0
    4xxxx-8xxx-12xx+13-3=0
    -p^4+4×p^3-6×p^2+4×p=80/81
    9.262*d^3-4.114*d^2-16.835*d+26.192=0
    1×19.1×200×140.9+360×941=360X
    1×19.1×200×198.6+360×941=360X

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