3(x+y)的平方-7(x+y)+8(x+y)的平方+6(x+y)合并同类项

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3(x+y)的平方-7(x+y)+8(x+y)的平方+6(x+y)合并同类项
3(x+y)的平方-7(x+y)+8(x+y)的平方+6(x+y)合并同类项

3(x+y)的平方-7(x+y)+8(x+y)的平方+6(x+y)合并同类项
=(3+8)(x+y)²+(-7+6)(x+y)
=11(x+y)²-(x+y)

3﹙x+y﹚²-7﹙x+y﹚+8﹙x+y﹚²+6﹙x+y﹚
=11﹙x+y﹚²-﹙x+y﹚

3(x+y)^2-7(x+y)+8(x+y)^2+6(x+y)
=3(x+y)^2+8(x+y)^2+6(x+y)-7(x+y)
=11(x+y)^2-(x+y)
=11x^2+22xy+11y^2-x-y

原式=(x+y)(3x+3y-7+8x+8y+6)
=(x+y)(11x+11y-1)

=(11x+11y-1)(x+y)

=(3+8)(x+y)²+(-7+6)(x+y)
=11(x+y)²-(x+y)