Question

2.75×2.2 0.78×27.5用简便方法怎么算?

2.75×2.2 0.78×27.5用简便方法怎么算?

Answer 1

2.75×2.2+0.78×27.5

解：简便计算
=2.75x2.2+7.8x2.75
=2.75x(2.2+7.8) 乘法分配律
=2.75x10
=27.5
祝学习进步。