x（40-2x）=350
    16.5t-20=15/4t-10
    20-16.5t=15/4t-10
    20-16.5t=10-15/4t
    x^2+(1-2/3)^2＝4/9
    （500-10（x-50））（x-40）=8000
    x:36=4:5
    36:x=4:5
    (2m+7)^2÷((1-4m)×(2m+2))
    (2m+7)^2÷((1-4m)×(2m+2))
    (2m+7)^2÷((1-4m)×(2m+2))
    (2m+7)(1-4m)＝0
    (2m+7)(2m+2)＝0
    k^2+1＝(5k-5)^2
    t^2-16t+16=0
    (5k+1)^2＝25×(k^2+1)
    pi
    po
    725x^2+300x+360=950x^3
    abs(pi)

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