[(4-6x)/0.01]-6.5=[(0.02-2x)/0.02]-7.5
    x/20＋x/30＋x/42＝3
    6x^2-2x=4
    6x²-2x=4
    x²-25x+24=0
    x(25-0.5x)=300
    （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

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