先去括号,在合并同类项.3x-2(5+2x)
问题描述:
先去括号,在合并同类项.
3x-2(5+2x)
答
3x-10-4x=-x-10
答
3x-2(5+2x)
=3x-2*5-2*2x
=3x-10-4x
=(3x-4x)-10
=-x-10
答
3x-2(5+2x)
=3x-10-4x
=3x-4x-10
=-x-10
答
3x-2(5+2x)=3x-10-4x
=-x-10