Question

几道简算题2

计算下面各题：
1．64又1/17×1/9
2．22又1/20×1/21
3．1/7×57又1/6
4．41又1/3×3/4＋51又1/4×4/5

Answer 1

1．64又1/17×1/9
=(63+1+1/17)×1/9
=(63+18/17)×1/9
=7+2/17=7又2/17

2．22又1/20×1/21
=(21+1+1/20)×1/21
=(21+21/20)×1/21
=1+1/20=1又1/20

同理
3．1/7×57又1/6
=1/7×(56+1+1/6)=8又1/6

4．41又1/3×3/4＋51又1/4×4/5
=(40+4/3)×3/4+(50+5/4)×4/5
=30+1+40+1=72

Answer 2

123

Answer 3

1.7又2/17
2.1又1/20
3.8又1/6
4.72

Answer 4

1.
(64*17+1)/17 * 1/9=(63*17+18)/17 * 1/9
=(7*17+2)/17=7又2/17
2.

（22*20+1）/20 *1/21=（21*20+21）/20*1/21
=21/20=1又1/20
3.4.同理

Answer 5

1. 7又2/17
2. 1又1/20
3. 8又1/6
4. 72