题目内容
计算(x+2y)(x-2y)+(x+1)(x-1)
答案:
解析:
解析:
| (x+2y)(x-2y)+(x+1)(x-1)
=(x2-4y2)+(x2-1) =x2-4y2+x2-1 =2x2-4y2-1
|
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题目内容
计算(x+2y)(x-2y)+(x+1)(x-1)
| (x+2y)(x-2y)+(x+1)(x-1)
=(x2-4y2)+(x2-1) =x2-4y2+x2-1 =2x2-4y2-1
|