一题初中数学化简题````进来看看```

(x-1/2y-1)(x-1/2y+1)-(x-1/2y-1)^2

2025-04-01 20:14:43

推荐回答（4个）

回答1：

(x-1/2y-1)(x-1/2y+1)-(x-1/2y-1)^2
=(x-1/2y-1)(x-1/2y+1-x+1/2y+1)
=2(x-1/2y-1)

如果1/2y=0.5y，答案就是这个

回答2：

(x-1/2y-1)(x-1/2y+1)-(x-1/2y-1)^2
=(x-1/2y-1)(x-1/2y+1-x+1/2y+1)
=2(x-1/2y-1)
如果按楼上的说法,那么就应包括无理数了
可初中应该没有接触无理数太深的东西

回答3：

等于0

回答4：

(x-1/2y-1)(x-1/2y+1)-(x-1/2y-1)^2
=(x-1/2y-1)(x-1/2y+1-x+1/2y+1)
=2(x-1/2y-1)