3.12×8+0.312×20怎么简便计算?
问题描述：
3.12×8+0.312×20怎么简便计算?
答
=3.12x8+3.12x2
=24.96+6.24
=31.20
3.12×8+0.312×20怎么简便计算?
=3.12x8+3.12x2
=24.96+6.24
=31.20