已知单项式M、N满足2x(M+3x)=6x^2y^2+N,求MN

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已知单项式M、N满足2x(M+3x)=6x^2y^2+N,求MN
注意是M乘N

2x（M+3x）=6x²y²+N
2Mx+6x²=6x²y²+N
∴2Mx=6x²y² N=6x²
即：M=3xy² N=6x²
∴MN=3xy² ×6x²=18x³y²

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