Question

填空题:1:2a(y-x)^2=( )( ) 2:-2m(y-x)^5=( )(x-y)^5 3:(a+b)(b-a)=

Answer 1

1:2a(y-x)^2=( 2a)((x-y)² ) 2:-2m(y-x)^5=(2m )(x-y)^5

3:(a+b)(b-a)=-(a+b)(a-b ) 4:-a(n-m^2)=a(m²-n )

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