3x+9+0.8=?5x+3-(4x+0.1)=?
问题描述:
3x+9+0.8=?5x+3-(4x+0.1)=?
答
3x+9+0.8
=3x+9.8
5x+3-(4x+0.1)
=5x+3-4x-0.1
=x+2.9