①2a²-4a=( ) ②x²y-9y=( )①2a²-4a=( )②x²y-9y=( )
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①2a²-4a=( ) ②x²y-9y=( )①2a²-4a=( )②x²y-9y=( )
①2a²-4a=( ) ②x²y-9y=( )
①2a²-4a=( )
②x²y-9y=( )
①2a²-4a=( ) ②x²y-9y=( )①2a²-4a=( )②x²y-9y=( )
①2a²-4a=2a(a-2 )
②x²y-9y=y(x²-9)=y(x+3)(x-3)
2a(a-2)
y(x+3)(x-3)
其实不知道这位童鞋想问什么,我就化简了一下。。