1个回答
展开全部
①2a-(3a-2b+2)+(3a-4b-1) =( )
=2a-3a+2b-2+3a-4b-1
=(2-3+3)a+(2-4)b+(-2-1)
=2a-2b-3
②5-(1-x)-1-(x-1)=( )
=5-1+x-1-x+1
=4
③2x-(x+3y)-(-x-y)-(x-y)=( )
=2x-x+3y+x+y-x+y
=x+5y
4. 1-(2a-1)-(3a+3)
解:原式=1-2a+1-3a-3
=-1-5a
5. 3(-ab+2a)-(3a-b)
解:原式=(-3ab+6a)-3a+b
=-3ab+6a-3a+b
=-3ab+3a+b
=2a-3a+2b-2+3a-4b-1
=(2-3+3)a+(2-4)b+(-2-1)
=2a-2b-3
②5-(1-x)-1-(x-1)=( )
=5-1+x-1-x+1
=4
③2x-(x+3y)-(-x-y)-(x-y)=( )
=2x-x+3y+x+y-x+y
=x+5y
4. 1-(2a-1)-(3a+3)
解:原式=1-2a+1-3a-3
=-1-5a
5. 3(-ab+2a)-(3a-b)
解:原式=(-3ab+6a)-3a+b
=-3ab+6a-3a+b
=-3ab+3a+b
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询