已知a,b互为相反数,则3a-2+3b=

问题描述:

已知a,b互为相反数,则3a-2+3b=

已知a,b互为相反数,则a+b=0
所以,3a-2+3b=3(a+b)-2=0-2=-2


∵a,b互为相反数
∴a+b=0
3a-2+3b
=3a+3b-2
=3(a+b)-2
=3*0-2
=-2

-2
a,b互为相反数则a+b=03a-2+3b=3(a+b)-2=0-2=-2望采纳。


a,b互为相反数
∴a+b=0
∴3a-2+3b
=3(a+b)-2
=3×0-2
=-2

3a-2+3b=-2说明:3a-2+3b         =3a+3b-2          =3(a+b)-2        &nb...

-2................................