9分之7乘以6分之5+6分之5乘以9分之5等于多少?用简便算法.
问题描述:
9分之7乘以6分之5+6分之5乘以9分之5等于多少?
用简便算法.
答
7/9*5/6+5/6*5/9 =5/6*[7/9+5/9] =5/6*14/9 =35/27
答
7/9×5/6+5/6×5/9 =5/6×(7/9+5/9) =5/6×12/9 =10/9 =1又1/9