求化简:(x-y)平方-1除以x-y-1答案是x-y+1 而我算出来的是y-x+1.原式=(x-y)(x-y)-1除以 【1(x-y)-1】约掉(x-y) =x-y-1除以-1=y-x+1.错哪儿了?没摄像头

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求化简:(x-y)平方-1除以x-y-1答案是x-y+1而我算出来的是y-x+1.原式=(x-y)(x-y)-1除以【1(x-y)-1】约掉(x-y)=x-y-1除以-1=y-x+1.错哪儿了?没摄像

求化简:(x-y)平方-1除以x-y-1答案是x-y+1 而我算出来的是y-x+1.原式=(x-y)(x-y)-1除以 【1(x-y)-1】约掉(x-y) =x-y-1除以-1=y-x+1.错哪儿了?没摄像头
求化简:(x-y)平方-1除以x-y-1
答案是x-y+1 而我算出来的是y-x+1.
原式=(x-y)(x-y)-1除以 【1(x-y)-1】约掉(x-y) =x-y-1除以-1=y-x+1.
错哪儿了?
没摄像头

求化简:(x-y)平方-1除以x-y-1答案是x-y+1 而我算出来的是y-x+1.原式=(x-y)(x-y)-1除以 【1(x-y)-1】约掉(x-y) =x-y-1除以-1=y-x+1.错哪儿了?没摄像头
(x-y)平方-1
=(x-y+1)(x-y-1)
所以
除以x-y-1后=x-y+1