（1400*12*0.9－70%*80x*6.36%）/（30%*80x+5%*80x）
    216t^6-6t^3+25t^2-8t+15=0
    2x-1=0
    3/X+1/(X+1)+4/(X+2)+4/(X+3)+1/(x+4)+3/(X+5)=0
    -0.1%=(1.019-X)÷1.019
    X-9=1/2x-2
    √(7-3X)+√((√(X-1)-3)^2)=1
    Y=0.045/0.06
    Y=4.5%/6%
    √(x+3-4(x-1))+√(x+8-(6√(X-1)))=1
    0.57%=(1.0208-X)÷1.0208
    √(x+3-4(x-1))+√(x+8-6√(X-1))=1
    √(x+20)+(x+21)^(1/3)=1
    3/2x
    √x+20+(x+21)^(1/3)=1
    20lg(15/(x(sqrt(1+x^2))))=-5.6
    X<3X+4
    (x)^(1/3)=3/(4-(x)^(1/3))
    2x^(2)－3x+1＝0
    10000x*x*x+x-0.2=0

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