49x×x-200x+150=0
    49x-200x+150=0
    －2x^2-12x-13=0
    6t²+5t＝125
    6x^2-14x+7
    6x^2-14x+7
    0.33X^2+0.75X=1.6
    0.33X^2+0.75X=16
    X∧2+X-6=0
    （X+2）*5=7X+2
    (X-1)^2+4^2=X^2
    12x^2-20.4x-1.68
    1044.89x^2+1989.78x-155.11=0
    x^2-x+2=4
    x^2+x-2=0
    （x╱5+50）（125-x）=5980
    250x(125-x)=49900
    6000(1+x)^2=8640
    (x-30)(600-(x-40)×10)=10000
    (x-30)(1000-10x)=10000

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