练习一
1.1/10 10 1/8 27
7/2 3/5 16 1
2.(1)3/8 4 3/2
(2)10 16
(3)> = < >
3.7/12 × 4 = 7/3(米)
4.500 × 3/10 = 150(米)
5.(1)5/8 × 4/5 = 1/2(吨)
(2)8/9 × 3/4 = 2/3(小时)
练习二
1.8/7 35;3/4 3/8 + 5/8;5/16
× 48 5/6 × 48
2.4.2 2/3 3.5 25
3.1/3 5 2/5 20 9 9
4.2/3 × 2/3 × 1/4 = 1/9(平方米)
5.(8/15 + 7/15)×3/4 × 1/2 × 2 = 3/4(平方米)
练习三
1.2/17 2/3 24
2.30 × (30 × 5/6) = 750(平方米)
3.750 + 750 × 4/5 = 1350(人)
4.24 × (1 + 1/4) = 30(公顷)
5.2400 × (1/3 - 1/4) = 200(棵)
6.4.5 + 4.5 × (1 - 1/9) = 8.5(亿元)
练习四
1.1 3/2 3/16 2.8
2/3 13/12 1/14 1/4
2.35 1/4 14
3.78 × 1/13 × 2/3 = 4(千克)
4.280 × (1 - 1/7) = 240(吨)
5.160 × 3/4 + 5 = 125(棵)
整理和复习
1.<>=>
2.1/2 7 5/7 22又22/33
3.(1)(1/2+1/3)×1/4=5/24
(2)4/5×3/4-1/12×6=1/10
4.48×5/6×4/5=32(本)
5.152×(1+3/8)=209(件)
6.720×(3/5+5/8-1)=162(个)