把(x+y),(x-y)个作为一个整体合并同类项1,7(x+y)-2(x+y)-4(x+y)+2(x+y)2,(x-y)²+2(x-y)-(x-y)-2(x-y)²
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把(x+y),(x-y)个作为一个整体合并同类项1,7(x+y)-2(x+y)-4(x+y)+2(x+y)2,(x-y)²+2(x-y)-(x-y)-2(x-y)²把(x+y),(
把(x+y),(x-y)个作为一个整体合并同类项1,7(x+y)-2(x+y)-4(x+y)+2(x+y)2,(x-y)²+2(x-y)-(x-y)-2(x-y)²
把(x+y),(x-y)个作为一个整体合并同类项
1,7(x+y)-2(x+y)-4(x+y)+2(x+y)
2,(x-y)²+2(x-y)-(x-y)-2(x-y)²
把(x+y),(x-y)个作为一个整体合并同类项1,7(x+y)-2(x+y)-4(x+y)+2(x+y)2,(x-y)²+2(x-y)-(x-y)-2(x-y)²
1,7(x+y)-2(x+y)-4(x+y)+2(x+y)
=3(x+y)
2,(x-y)²+2(x-y)-(x-y)-2(x-y)²
=-(x-y)²+(x-y)
1,7(x+y)-2(x+y)-4(x+y)+2(x+y)
=(7-2-4+2)(x+y)
=3(x+y)
2,(x-y)²+2(x-y)-(x-y)-2(x-y)²
=-(x-y)²+(x-y)
把(x+y),(x-y)个作为一个整体合并同类项1,7(x+y)-2(x+y)-4(x+y)+2(x+y)2,(x-y)²+2(x-y)-(x-y)-2(x-y)²
把x-y看作一个整体,合并同类项3(y-x)+2(x-y)+(y-x)-(x-y)谢谢了,
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