5(x-y)+2(x-y)-4(x-y)=
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5(x-y)+2(x-y)-4(x-y)=
5(x-y)+2(x-y)-4(x-y)=
5(x-y)+2(x-y)-4(x-y)=
5(x-y)+2(x-y)-4(x-y)
= (5 +2 -4 )(x-y)
= 3 (x-y)
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5(x-y)+2(x-y)-4(x-y)
=(5+2-4)(x-y)
=3(x-y)
=3x-3y
(x-y)^3×(y-x)^4+(x-y)^2×(y-x)^5
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2分之x+y+3分之x-y;4(x+y)-(x-y)谢谢了,
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合并同类项3(x-y)^4-(2(x-y)^4-5(X-Y)^4)-(X-Y)^4合并同类项3(x-y)^4-(2(x-y)^4-5(X-Y)^4)-(X-Y)^4