用简便方法计算2乘以(5/2-1/13)乘以13

问题描述:

用简便方法计算2乘以(5/2-1/13)乘以13

2乘以(5/2-1/13)乘以13
=2×5/2 ×13-2×1/13×13
=5×13-2
=65-2
=63