2t*t+1.4t-0.145=0
    5/（x²-2x）-4/（x²+2x）=3/（x²-4）
    x=2^x
    cosx=－0.276
    1/1+1/2-1/x=1/3
    x=x^5
    x=x^3
    x=x
    x/3=x/5
    1÷［1/X+（1/X+40）］=0.04
    1÷（1/X+1/X+40）=0.04
    1/X+1/X+40=0.04
    5*x*x-8*x-16=0
    4x(x-2.5)(x-2.5)-4=0
    4x(x-5/2)(x-5/2)-4=0
    (2√2-√2x)^2+(2√2)^2 = (3√2-√2x)^2
    (2√2-x)^2+(2√2)^2 = (3√2-√2x)^2
    (2√2-x)+(2√2)^2 = (3√2-√2x)^2
    (2√2-x)+(2√2)^2=(3√2-√2)^2
    x*x-49x+180=0

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