-2x^2y(-x^my+3xy^3)=2x^5y^2-6x^3y^n,求mn的值 快
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-2x^2y(-x^my+3xy^3)=2x^5y^2-6x^3y^n,求mn的值 快
-2x^2y(-x^my+3xy^3)=2x^5y^2-6x^3y^n,求mn的值 快
-2x^2y(-x^my+3xy^3)=2x^5y^2-6x^3y^n,求mn的值 快
-2x^2y(-x^my+3xy^3)=2x^(m+2)y^2-6x^3y^4
-2x^2y(-x^my+3xy^3)=2x^5y^2-6x^3y^n
m+2=5,n=4
解得
m=3
n=4
mn=3*4=12
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