若x+y=12,xy=9,求(x^2+3xy+2y^2)÷(x^2y+2xy^2)的值
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若x+y=12,xy=9,求(x^2+3xy+2y^2)÷(x^2y+2xy^2)的值若x+y=12,xy=9,求(x^2+3xy+2y^2)÷(x^2y+2xy^2)的值若x+y=12,xy=9,求
若x+y=12,xy=9,求(x^2+3xy+2y^2)÷(x^2y+2xy^2)的值
若x+y=12,xy=9,求(x^2+3xy+2y^2)÷(x^2y+2xy^2)的值
若x+y=12,xy=9,求(x^2+3xy+2y^2)÷(x^2y+2xy^2)的值
(x^2+3xy+2y^2)÷(x^2y+2xy^2)
=(x+2y)(x+y)/xy(x+2y)
=(x+y)/xy
=12/9
=4/3
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