1、(15 - 6) ÷ 3 = 3
2 × (5 + 3) = 16
15 ÷ (6 - 3) = 5
2、(1)8 + 16 ÷ 8
= 8 + 2
= 10
(2)40 - 15 × 2
= 40 - 30
= 10
(3)(49 - 28) ÷ 7
= 21 ÷ 7
= 3
(4)80 ÷ 8 × 10
= 10 × 10
= 100
3、72 57 44 5 4 6
4、(75 - 43) ÷ 4 - 8(页)
5、10 + 10 ÷ 2 = 15(元)
6、(1)(100 - 70) ÷ 6 = 5(瓶)
(2)19 - 4 × 4 = 3(元)
(3)例:买3桶方便面和1桶调和油需要多少元?
3 × 4 + 70 = 82(元)