Question

直接寫出下面各題得數(shù)． 3 5 × 1 3 =	4 17 × 1 2 =	5 9 - 3 9 =	0× 6 7 =
5 6 × 5 6 =	4 9 - 1 3 =	24× 3 8 =	0.5×0.8=

Answer 1

分析：依據(jù)分數(shù)四則運算的法則，即分數(shù)乘整數(shù)，用分數(shù)的分子和整數(shù)相乘的積做分子，分母不變；分數(shù)乘分數(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；分數(shù)除以一個數(shù)（0除外），等于乘這個數(shù)的倒數(shù)，0乘任何數(shù)都得0，即可逐題解答．

解答：解：

3 5 × 1 3 = 1 5	4 17 × 1 2 = 2 17	5 9 - 3 9 = 2 9	0× 6 7 =0
5 6 × 5 6 = 25 36	4 9 - 1 3 = 1 9	24× 3 8 =9	0.5×0.8=0.4

點評：此題主要考查分數(shù)四則運算的法則的靈活應(yīng)用．