150*0.6+0.65（x-150）=277.5
    250=4（10000/x）+(5100/(x+22.4))
    250=4（10000/x）+(7600/(x+22.4))
    X+X*0.06=8000
    X+X*0.13=321912
    180 = -214.3347.093*x-0.027*x^2
    180=-214.334 7.093*x-0.027*x^2
    180=-214.334 7.093*x-(0.027*x 0.027*x)
    x^3 + (0.048738)*x^2-(0.0000008796001)*x-(1.8*10^-19)=0
    x^3 + (0.048738)*x^2-(0.0000008796001)*x-1.8*10^-19=0
    87*Y+(Y-107.86)*81=15495
    3*(1+a)^6+6*(1+a)^5+9*(1+a)^4=1
    x²+6x+2=0
    1.25X∧3-x＝-2
    (x+1)^5*(x-2)=0
    (x+1)^5
    sinx=5
    sinx=520
    sinx=520
    100+(10*tan(x))^2=10/cos(x)

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