Question

直接寫出得數(shù)． 64× 7 8 =	11 18 ×12=	7 24 × 5 14 =
39× 5 13 =	5 34 ×51=	4 27 × 9 16 =
2× 4 5 =	3 8 × 4 5 =	5 9 × 2 3 =

Answer 1

分析：本題根據(jù)分?jǐn)?shù)乘法的運(yùn)算法則計(jì)算即可．
分?jǐn)?shù)乘整數(shù)，用分?jǐn)?shù)的分子和整數(shù)相乘的積做分子，分母不變；
分?jǐn)?shù)乘分?jǐn)?shù)，用分子相乘的積做分子，分母相乘的積做分母，能約分的要約分．

解答：解：

64× 7 8 =56	11 18 ×12= 22 3	7 24 × 5 14 = 5 48
39× 5 13 =15	5 34 ×51= 15 2	4 27 × 9 16 = 1 12
2× 4 5 = 8 5	3 8 × 4 5 = 3 10	5 9 × 2 3 = 10 27

點(diǎn)評(píng)：完成本題要細(xì)心，注意約分．