9分之5*86又11分之7+11分之5*9分之1+4*11分之5

问题描述:

9分之5*86又11分之7+11分之5*9分之1+4*11分之5
要简算

59×86又7/11 +19 ×5/11 +4×5/11
= 5/9×(86×11+7)/11 +19 ×5/11 +4×5/11
= 5/11 ×{(86×11+7)/9 +1/9 +4}
= 5/11 ×(86×11+7+1+9×4)×1/9
= 5/11 ×(86×11+44)×1/9
= 5/11 ×11×(86+4)×1/9
= 5×(86+4)/9
= 5×90/9
= 50