化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²(X-Y)视为整体
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化简3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²(X-Y)视为整体化简3(X-Y)
化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²(X-Y)视为整体
化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
(X-Y)视为整体
化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²(X-Y)视为整体
3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
=(3-6)(X-Y)²+(-4+7)(X-Y)
=-3(X-Y)²+3(X-Y)
3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
=3(X-Y)-3(X-Y)²
=3(X-Y)(1-X+Y)