✔ 最佳答案
(1)
(5/11) x 14.3 ÷ 2.6 + 0.5
= (5/11) x (14.3 ÷ 2.6) + 0.5
= (5/11) x 5.5 + 0.5
= 2.5 + 0.5
= 3
(2)
0.9 ÷ (3/4) + 0.6 ÷ (3/4)
= (0.9 + 0.6) ÷ (3/4)
= 1.5 x (4/3)
= 2
(3)
3.5 ÷ [2又1/2 + 3.8]
= 3.5 ÷ [2.5 + 3.8]
= 3.5 ÷ 6.3
= 3.5 x (1/6.3)
= 5/9
(4)
5.2 - [9又(1/4) - 4.75]
= 5.2 - (9.25 - 4.75)
= 5.2 - 4.5
= 0.7
(5)
(35/36) ÷ (7/12) - (7/12) ÷ (35/36)
= (35/36) x (12/7) - (7/12) x (36/35)
= (5/3) - (3/5)
= (25/15) - (9/15)
= 16/15
= 1又1/15
(6)
0.88 x 28 - (22/25) x 18
= 0.88 x 28 - 0.88 x 18
= 0.88 x (28 - 18)
= 0.88 x 10
= 8.8
(7)
比例尺
= 16 公分 : 8 公里= 16 公分 : 8 x 1000 x 100 公分
= 1 : 50000
(8)
甲數 =8又(1/3) = 25/3
乙數 = (25/3) x (3/5)
丙數 = (25/3) x 1.6
甲、乙、丙三數之和
= (25/3) + (25/3) x (3/5) + (25/3) x 1.6
= (25/3) x [1 + (3/5) + 1.6]
= (25/3) x [1 + 0.6 + 1.6]
= (25/3) x 3.2
= 80/3
= 26又2/3
(9)
縮圖上的長度
= (18 公里) x(1/200000)
= (18 x 1000 x 100 公分) x(1/200000)
= 9 公分
(10)
小達比小明多走距離
= 7.2 x (2/3) - 7.2 x (2/3) x 0.75 公里
= 7.2 x (2/3) x (1 - 0.75) 公里
= 7.2 x (2/3) x 0.25 公里
= 1.2 公里