（3x-4y)(7x-8y)+(11x-12y)(8y-7x)=??
答案:2 悬赏:10 手机版
解决时间 2021-03-27 02:53
- 提问者网友：精神病院里
- 2021-03-26 08:24
（3x-4y)(7x-8y)+(11x-12y)(8y-7x)=??
最佳答案
- 五星知识达人网友：西岸风
- 2021-03-26 09:29
（3x-4y)(7x-8y)+(11x-12y)(8y-7x)
=(3x-4y)(7x-8y)-(11x-12y)(7x-8y)
=(7x-8y)[(3x-4y)-(11x-12y)]
=(7x-8y)(-8x+8y)
=-8(x-y)(7x-8y)
=(3x-4y)(7x-8y)-(11x-12y)(7x-8y)
=(7x-8y)[(3x-4y)-(11x-12y)]
=(7x-8y)(-8x+8y)
=-8(x-y)(7x-8y)
全部回答
- 1楼网友：逃夭
- 2021-03-26 10:02
=3x*7x-3x*8y-4y*7x+4y*8y+11x*8y-11x*7x-12y*8y+12y*7x
=21xx-24xy-28xy+32yy+88xy-77xx-96yy+84xy
=-56xx-64yy+120xy
=21xx-24xy-28xy+32yy+88xy-77xx-96yy+84xy
=-56xx-64yy+120xy
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