9.7X(2.45-0.31)怎么简便计算
问题描述:
9.7X(2.45-0.31)怎么简便计算
答
9.7X(2.45-0.31)
=(10-0.3)×2.14
=10×2.14 - 0.3×2.14
=21.4 - 0.642
=20.758