xx—2xy+yy—1除以x—y—1
=[(x-y)²-1]÷（x-y-1）
=(x-y+1)(x-y-1)÷（x-y-1）
=x-y+1
猜你喜欢
- 1Neither of us has much time to write back to him.(改写句子,句意不变）
- 2Are you l______ Shang hai for Beijing tommorrow?
- 3电压表与小灯泡串联在电路中电压表是否有示数.如果有是测哪个电压
- 4已知ab不等于0 证明a+b=1的充要条件是a^3+b^3+ab-a^2-b^2=0 希望能人们帮帮忙
- 5连词成句:did,teacher,summer,go,your,last,where,holiday
- 6有关学会生存的文章
- 7I'm afraid of the dark.I never go out alone at night的同义句
- 85、从下列词语中选择3个(必有一组关联词),打上“√”,写一段通顺连贯的话.(3分)
- 91 -Who should be responsible for the accident?
- 10你的书包是什么颜色的?用英文怎么说