x-x/2-x/4+2-x/8-5=15
    [c(3,2)*c(40,2)+c(40,1)*c(3,3)]/c(43,4)
    [c(3，2）*c（40,2）+c(40,1)*c(3,3)]/c(43,4)
    1÷x+（1÷x×0.05）=1.5
    x=124688.02+(x*6.72%)
    （x-1000）÷x=0.06
    X*0.07=23268.11
    s^3+2s^2+3s+1=0
    (s+1)/(s^3+2s^2+3s+1)=0
    55x+15=65.25x+13.05
    x²+x=19054
    tin
    xxxxxxxxxxx=1
    ex+sinx=0
    exlnx=1
    x²-3x+1=0
    x+2=9
    X/1.03*0.03+(1-X)/1.13*0.13=1/1.09*0.09
    3755505.88/（1+x）*x=193884.29
    2^x+7^x+x^2+x=-125

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