4%/4=X*48.26%+（1+X）*（-32.55%）
    ln（-x）
    [1一（1÷7）X]÷x=[1÷（1÷14）]÷（x+1÷2）
    （1+30%）x*90%+(300-x)*120%*90%-300 = 42
    sinx=0.75
    3b^2+69-32b=0
    0.4：（x+6）=20%：5x
    -2x^2+120x-1350=400
    -2x^2+120x-135=400
    x²+㏒5=3
    x+1=2
    x=6.88/(0.95*(2*9.8*(32.67-x*0.95))^0.5)
    x=6.88/(0.95*(2*9.8*(27.67-x*0.95))^0.5)
    x=6.88/(0.95*(2*9.8*(22.67-x*0.95))^0.5)
    x=6.88/(0.95*(2*9.8*(17.67-x*0.95))^0.5)
    x=6.88/(0.95*(2*9.8*(12.67-x*0.95))^0.5)
    x=6.88/(0.95*(2*9.8*(7.67-x*0.95))^0.5)
    x^3-2x^2=144
    x=6.88/(0.95*(2*9.8*(2.67-x*0.95))^0.5)
    x=6.43/(0.95*(2*9.8*(7.67-x*0.95))^0.5)

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