(x+2y+3)^2-(x-2y+3)(x-2y-3)
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解决时间 2021-11-14 20:53
- 提问者网友：疯子也有疯子的情调
- 2021-11-14 16:17
(x+2y+3)^2-(x-2y+3)(x-2y-3)
最佳答案
- 五星知识达人网友：鱼芗
- 2021-11-14 17:55
(x+2y+3)^2 - (x-2y+3) (x-2y-3)
=(x+2y)²+6(x+2y)+9 -[(x-2y)+3][(x-2y)-3]
=(x+2y)²+6(x+2y)+9-(x-2y)²+9
=(x+2y)²-(x-2y)²+6(x+2y)+18
=8xy+6x+12y+18
我正好也学到这呢
=(x+2y)²+6(x+2y)+9 -[(x-2y)+3][(x-2y)-3]
=(x+2y)²+6(x+2y)+9-(x-2y)²+9
=(x+2y)²-(x-2y)²+6(x+2y)+18
=8xy+6x+12y+18
我正好也学到这呢
全部回答
- 1楼网友：妄饮晩冬酒
- 2021-11-14 20:05
意向不明
- 2楼网友：琴狂剑也妄
- 2021-11-14 19:50
(x+2y+3)^2 - (x-2y+3) * (x-2y-3)
=(x+2y+3)^2 - (x-2y)^2+9
=(x+2y+3+x-2y)*(x+2y+3-x+2y)+9=(2x+3)*(4y+3)+9
=8xy+6x+12y+18
=(x+2y+3)^2 - (x-2y)^2+9
=(x+2y+3+x-2y)*(x+2y+3-x+2y)+9=(2x+3)*(4y+3)+9
=8xy+6x+12y+18
- 3楼网友：过活
- 2021-11-14 18:17
(x+2y+3)^2 - (x-2y+3) (x-2y-3)
=(x+2y)²+6(x+2y)+9 -[(x-2y)+3][(x-2y)-3]
=(x+2y)²+6(x+2y)+9-(x-2y)²+9
=(x+2y)²-(x-2y)²+6(x+2y)+18
=8xy+6x+12y+18
=(x+2y)²+6(x+2y)+9 -[(x-2y)+3][(x-2y)-3]
=(x+2y)²+6(x+2y)+9-(x-2y)²+9
=(x+2y)²-(x-2y)²+6(x+2y)+18
=8xy+6x+12y+18
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