Question

3 4 ×2=	3 4 + 1 2 =	2 5 ×15=	7 8 × 4 21 =
1 2 + 1 7 - 1 2 + 1 7 =	2 3 - 1 2 =	8÷ 2 3 =	0× 12 17 =
（12+ 1 5 ）× 1 6 =	1 2 × 1 7 ÷ 1 2 × 1 7 =

Answer 1

分析：根据分数的四则混合运算方法进行计算即可．

解答：

解： 3 4 ×2=1 1 2               3 4 + 1 2 =1 1 4              2 5 ×15=6            7 8 × 4 21 = 1 6 1 2 + 1 7 - 1 2 + 1 7 = 2 7               2 3 - 1 2 = 1 6               8÷ 2 3 =12           0× 12 17 =0 （12+ 1 5 ）× 1 6 = 1 30         1 2 × 1 7 ÷ 1 2 × 1 7 = 1 49 点评：此题主要考查的是分数的四则混合运算．