（x+1）^(2)=0
    1/（x+1）^(2)=0
    12.08x^3+77.42x^2-78.28x-1689.43=0
    300/x+300/2x
    1-1/（x+1）=0
    1-（1/x+1）=0
    2x+6=10
    2x+3=5
    4.9n-n=39.9
    2x=5
    X +24-30等于52
    x÷3=8.3
    x/3=8.3
    2.7 = 10^(11.76-2x)+10^(2.76-x)+10^(50.86-3x)+10^(67.36-5x)+10^(90.56-6x)+2*10^(41.52-5x)
    X+X=557150
    X+X/360*14=557150
    12.08x^3+82.69x^2-9.96x-1145.88=0
    0.66+1.36*x*(5.62+0.95*70) = 0.9+1.36*0.06*70
    x*e^2x+2x^2*e^2x-x-1=0
    （1+x）^5=1.28

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