Question

快速计算．

2 9 ×3=	3 4 ×12=	5 18 ×6=	3× 5 6 =	4× 3 10 =
20× 3 10 =	4× 7 12 =	3× 4 15 =	100× 1 25 =	50× 7 10 =
7 11 ×33=	24× 8 15 =	35× 3 28 =	10× 3 5 =	12× 1 6 =
7× 1 14 =	2 5 ×200=	0× 4 11 =	11 48 ×36=	21 25 ×15=
4× 2 11 =	26× 2 13 =	4 1 2 ×1=	3 4 × 3 4 =	3 4 × 1 2 =
3 8 × 5 6 =

Answer 1

分析：依据分数乘法的计算法则，进行计算即可，要注意能约分的要先约分再计算．

解答：解：

2 9 ×3= 2 3	3 4 ×12=9	5 18 ×6= 5 3	3× 5 6 = 5 2	4× 3 10 = 6 5
20× 3 10 =6	4× 7 12 = 7 3	3× 4 15 = 4 5	100× 1 25 =4	50× 7 10 =35
7 11 ×33=21	24× 8 15 = 64 5	35× 3 28 = 15 4	10× 3 5 =6	12× 1 6 =2
7× 1 14 = 1 2	2 5 ×200=80	0× 4 11 =0	11 48 ×36= 33 4	21 25 ×15= 63 5
4× 2 11 = 8 11	26× 2 13 =4	4 1 2 ×1=4 1 2	3 4 × 3 4 = 9 16	3 4 × 1 2 = 3 8
3 8 × 5 6 = 5 16

点评：此题主要依据分数乘法的计算法则的灵活应用．