作业帮已知单项式M、N满足3x(M+6x^2)=18xy+N,求M和N?
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已知单项式M、N满足3x(M+6x^2)=18xy+N,求M和N?
已知单项式M、N满足3x(M+6x^2)=18xy+N,求M和N?
已知单项式M、N满足3x(M+6x^2)=18xy+N,求M和N?
3x(M+6x^2)=3xM+3*6x^2=3xM+18x^2
即3xM+18x^2=18xy+N
①
3xM+18x^2和18xy+N
都是两项式,每一项可一一对应
3xM=18xy,则M=18xy/3x=6y
N=18x^2 (还剩下一项,即与N对应)
②
得3xM+18x^2=18xy+N
即3xM-N=18xy-18x^2
3xM=-18x^2,即M=-18x^2/3x=-6x
-N=18xy,即N=-18xy
③与②结果相同
答：M=6y或-6x,N=18x^2或-18xy
（不确定对不对,不过这可是我一个字一个字敲出来的,(>_
确定原题正确？
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