解题思路:(A)根据“被除数=除数×商+余数”可得:除数=(被除数-余数)÷商,由此列式即可;
(B)[7/8]与[5/6]的和是([7/8]+[5/6]),差是([7/8]-[5/6]),用和减去差,列式为([7/8]+[5/6])-([7/8]-[5/6]),计算即可.
(A)(65-5)÷5,
=60÷5,
=12;
答:除数是12.
(B)([7/8]+[5/6])-([7/8]-[5/6]),
=[7/8]+[5/6]-[7/8]+[5/6],
=[5/3];
答:结果是[5/3].
点评:
本题考点: 整数四则混合运算;分数的四则混合运算.
考点点评: (A)此题考查了被除数、除数、商和余数的关系;
(B)此题主要考查“两个数的和减去这两个数的差”的列式及简算.