8分之15➖11分之7➕15分之7➖11分之4简便运算？

解：
8分之15➖11分之7➕15分之7➖11分之4
=15/8-7/11+7/15-4/11
=15/8+7/15-4/11-7/11
=15/8+7/15-(4/11+7/11)
=15/8+7/15-1
=15/8-1+7/15
=7/8+7/15
=7×(1/8+1/15)
=7×(15/120+8/120)
=7×23/120
=161/120
=7×11/90
=77/90

15/8-7/11+7/15-4/11
=15/8-（7/11+4/11）+7/15
=15/8-1+7/15
=7/8+7/15
=105/120+56/120
=161/120本回答被网友采纳