4^x-x^2-2x-1=（x+1）2^x
    X/30+X/42+X/56=1
    3x^2-lnx-1=0
    cosx-sinx
    X+X/94.3%*5.7%=80280.96
    π*(D^2-48^2)=1000000*4*0.042
    π*(D^2-74^2)=1000000*4*0.042
    π*(314^2-48^2)=L*4*0.042
    π*(314^2-74^2)=L*4*0.042
    3/4＝5t²
    x^2-36x+325=0
    3/4（2x-5）+1/6（x+7）=2/3（x-2）
    1/3+1/2x=3/4+1/4x
    1/2x=3/4+1/3x
    1/2（4-x）=2/5
    4+x/3=5/6
    12/x+1=7
    5x/4=4x/4-7/6
    3/7-1/4x=1/2
    1/4x+1/5=3/4

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