若(5x+M)^2=25x^2-10xy+N求M、N
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若(5x+M)^2=25x^2-10xy+N求M、N
若(5x+M)^2=25x^2-10xy+N
求M、N
若(5x+M)^2=25x^2-10xy+N求M、N
解由(5x+M)^2
=(5x)^2+2×5x×M+M^2
=25x^2-10xM+M^2
又由(5x+M)^2=25x^2-10xy+N
即25x^2-10xM+M^2=25x^2-10xy+N
即M=y
N=M^2
即M=y,N=M^2=y^2.
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