-3(2s-5)+6s=?
问题描述:
-3(2s-5)+6s=?
答
-3(2s-5)+6s
=-6s+15+6s
=-6s+6s+15
=0+15
=15
-3(2s-5)+6s=?
-3(2s-5)+6s
=-6s+15+6s
=-6s+6s+15
=0+15
=15