137x135/136+135x1/136 如何简算?
问题描述:
137x135/136+135x1/136 如何简算?
答
=137×135/136+×135/136
=(137+1)×135/136
=138×(1-1/136)
=138×1-138×1/136
=138-69/68
=136又67/68