作业帮已知单项式M,N满足等式3x(M-5x)=6xy+N,则M= ,N=
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已知单项式M,N满足等式3x(M-5x)=6xy+N,则M= ,N=
已知单项式M,N满足等式3x(M-5x)=6xy+N,则M= ,N=
已知单项式M,N满足等式3x(M-5x)=6xy+N,则M= ,N=
展开之后就是 3Mx-15x^2=6x^2y^3+N 你这里-15x^2总不能等于6x^2y^3吧!因为M,N都是单项式,所以有3Mx=6x^2y^3 -15x^2=N 所以N=-15x^2 M=2xy^3
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