1.分解因式:x²-y²-3x-3y 2.计算:(y-x的-1次)除以(x-y的-1次) 要有过程,谢谢啦
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解决时间 2021-03-15 10:45
- 提问者网友:蔚蓝的太阳
- 2021-03-15 07:41
1.分解因式:x²-y²-3x-3y 2.计算:(y-x的-1次)除以(x-y的-1次) 要有过程,谢谢啦
最佳答案
- 五星知识达人网友:廢物販賣機
- 2021-03-15 09:07
1.分解因式:x²-y²-3x-3y
=(x+y)(x-y)-3(x+y)
=(x+y)(x-y-3)
2.计算:(y-x的-1次)除以(x-y的-1次)
=(xy-1)/x×y/(xy-1)
=y/x
=(x+y)(x-y)-3(x+y)
=(x+y)(x-y-3)
2.计算:(y-x的-1次)除以(x-y的-1次)
=(xy-1)/x×y/(xy-1)
=y/x
全部回答
- 1楼网友:青灯有味
- 2021-03-15 09:57
x²-y²-3x-3y
=﹙x+y)(x-y)-3(x+y)
=(x+y)(x-y-3)
- 2楼网友:愁杀梦里人
- 2021-03-15 09:29
x²-y²-3x-3y
=(x+y)(x-y)-3(x+y)
=(x+y)(x-y-3)
(y-x的-1次)除以(x-y的-1次)
=(y-1/x)÷(x-1/y)
=[(xy-1)/x]÷[(xy-1)/y]
=(xy-1)/x×y/(xy-1)
=y/x
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