（1/1+x）×x
    5.51x^2+2.44x=2.74
    5.51x^2+2.44x=2.74
    5.51x^2+2.44x=2.74
    5.51x^2+2.44x=2.74
    5.51x^2+2.44x=2.74
    5.61x^2+2.44x=2.74
    4t^3/（t+1）^2
    a²+a=225
    sinx*（tanx）^2
    (x-180)÷1500=(X-180-320)÷1000
    (x-180)÷1500=(X-180-320)÷1000
    X-180(1-25%)=(X-180-4000x80%)x(1-75%)
    x^2+2x+1=0
    tan x ＝0.5
    1000+0.05x=0.2x
    5000+0.25xx=x
    10x-x=288
    22x+30（1/2x+15）=6000
    X÷2=3.6

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