136乘以17减去135乘以5减去135乘以2的简便算法

问题描述:

136乘以17减去135乘以5减去135乘以2的简便算法

136X17-135X5-135X2
=(135+1)X17-135X5-135X2
=135X17+17-135X5-135X2
=135(17-5-2)+17
=135X10+17
=1350+17
=1367