2x+5y与4x-4y的一半的差为( ) A.4x-y B.y-x C.7y D.x-7y
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2x+5y与4x-4y的一半的差为( ) A.4x-y B.y-x C.7y D.x-7y
2x+5y与4x-4y的一半的差为( ) A.4x-y B.y-x C.7y D.x-7y
2x+5y与4x-4y的一半的差为( ) A.4x-y B.y-x C.7y D.x-7y
2x+5y-(1/2)(4x-4y)=7y
C
C
2X+5Y-1/2(4X-4Y)
2X+5Y-2X+2Y
5Y+2Y
7Y