合并同类项 2(x-y)+1/2(x-y)-3(y-x)
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合并同类项 2(x-y)+1/2(x-y)-3(y-x)
合并同类项 2(x-y)+1/2(x-y)-3(y-x)
合并同类项 2(x-y)+1/2(x-y)-3(y-x)
2(x-y)+1/2(x-y)-3(y-x)
=2(x-y)+1/2(x-y)+3(x-y)
=(2+1/2+3)(x-y)
=5.5(x-y)
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