3xy-7x+7y=3xy-7(x-y) =3×3-7×5 =-26.3xy-7(x-y)谁告诉我为什么这么做?
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3xy-7x+7y=3xy-7(x-y) =3×3-7×5 =-26.3xy-7(x-y)谁告诉我为什么这么做?
3xy-7x+7y=3xy-7(x-y) =3×3-7×5 =-26.
3xy-7(x-y)
谁告诉我为什么这么做?
3xy-7x+7y=3xy-7(x-y) =3×3-7×5 =-26.3xy-7(x-y)谁告诉我为什么这么做?
题不具体.但在我看来我觉得这道题应该是个整体法的思想.
我觉得你可能知道xy=3 x-y=5.
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