作业帮A*B=260,A*2B=( ),3A*B=( ),A*(B/2)=( ),(A/4)*(B*4)=( )
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A*B=260,A*2B=( ),3A*B=( ),A*(B/2)=( ),(A/4)*(B*4)=( )
A*B=260,A*2B=( ),3A*B=( ),A*(B/2)=( ),(A/4)*(B*4)=( )
A*B=260,A*2B=( ),3A*B=( ),A*(B/2)=( ),(A/4)*(B*4)=( )
A*B=260,A*2B=(520 ),3A*B=( 780),A*(B/2)=( 130),(A/4)*(B*4)=(260 )