百分數:
1 . 4 / 5 X 0 . 2 5 X ( 1 - 5 0 % )
2 . 2 / 3 X 1 . 8 ÷ ( 1 + 2 0 % )
2006-10-26 17:04:55 · 3 個解答 · 發問者 Plumas 3 in 科學 ➔ 數學
唔該我想要直式
2006-10-26 17:08:45 · update #1
唔好意思..
應該是列式..
2006-10-26 17:14:02 · update #2
1.
4/5 x 0.25 x (1 - 50%)
= 4/5 x 1/4 x 1/2
= 4 x 1 x 1
______________
5 x 4 x 2
= 4
_______
40
= 1 / 10 or 0.1
2.
2/3 x 1.8 ÷ (1 + 20% )
= 2/ 3 x 18 / 10 ÷ 120%
= 2/3 x 18/10 x 100/120
= 2x18 x 100
_____________
3 x 10 x 120
= 360
_____
3600
= 1 / 10 or 0.1
2006-10-26 21:11:26 補充：
this one sin arm2.2/3 x 1.8 ÷ (1 20% )= 2/ 3 x 18 / 10 ÷ 120%= 2/3 x 18/10 x 100/120= 2x18 x 100_____________3 x 10 x 120= 3600 _____ 3600= 1
2006-10-26 17:10:14 · answer #1 · answered by k sir 3 · 0⤊ 0⤋
1. 0.1
2. 1
2006-10-26 21:08:47 補充：
2. 5/72..咁錯計數機添,,
2006-10-26 17:07:45 · answer #2 · answered by ? 2 · 0⤊ 0⤋
1.
4 / 5 x 0. 25 x ( 1 - 50%)
= 0.8 x 0.25 x 0.5
= 0.2 x 0.5
= 0.1
2.
2 / 3 X 1 . 8 ÷ ( 1 + 2 0 % )
= 2 / 3 x 1 / 8 x 5 / 6
= 10 / 144
= 5 / 72
2006-10-26 17:07:40 · answer #3 · answered by J 7 · 0⤊ 0⤋