1.路長250米, a走了2/5米, b 走了3/10, 問a比？走路幾米?
2.A 每月入息3000元, 付租用去3/8, 生活費用去2/5 , 其餘儲蓄起來, 他每可儲蓄多少 元?
3.甲有7200元, 第一天用去1/2, 第二天再用去1/3, 問還餘款多少元?
4.大明有書36本, 小明所有的書是他的3/4; 問天人共有書幾本?
5.5/16* 8/15 * 5/7=
6.布長64米, 先剪去1/4, 再剪去餘下的3/8, 還餘下布多少米?
7.西餅100件, 賣了一天, 餘下8/25, 每件售價1 ½元, 共賣得幾元?
8.冰一塊重48公斤, 溶去1/4, 還餘多少公斤?
9.小明有5 元, 先用去1/5, 再用去所餘的3/4, 還餘幾元 ?
10橙一箱126個, 甲得4/7, 其餘給乙, 問甲比乙多得幾個?
Maths
2008-02-16 2:07 am
回答 (2)
2008-02-16 2:25 am
✔ 最佳答案
1. a走了: (2/5)*250m=100mb走了:(3/10)*250m=75m
so a比b多走了:100m-75m=25m
2. $3000-(3/8)*$3000+(2/5)*$3000
=$(3000-1125-1200)
=$675
3. $7200-(1/2)*7200-(1/3)*7200
=$1200
4. 36+(3/4)*36
=36+27
=63
5. 5/16* 8/15 * 5/7=5/168
2008-02-16 2:29 am
1.
a走了 250 x (2/5) = 100m
b走了 250 x (3/10) = 75m
a比b 走多了 100 - 75 = 25m
2.
$3000 (1 - 3/8 - 2/5)
= $3000 x (40/40 - 15/40 - 16/40)
= $3000 x (9/40)
= $675
3. 問題不大清楚
如第二天是用第一天餘下的1/3
$7200 x (1 - 1/2) x (1 - 1/3)
= $7200 x (1/2) x (2/3)
= $7200 x (1/3)
= $2400
如第二天是用原本的1/3
$7200 x (1 - 1/2 - 1/3)
= $7200 x (6/6 - 3/6 - 2/6)
= $7200 x (1/6)
= $1200
4.
36 x (1 + 3/4)
= 36 x (4/4 + 3/4)
= 36 x (7/4)
= 63本
5.
5/16 x 8/15 x 5/7
= 1/16 x 8/3 x 5/7 (頭兩項分子分母相約)
= 1/2 x 1/3 x 5/7 (頭兩項分子分母相約)
= 5/42
6.
64 x (1 - 1/4) x (1 - 3/8)
= 64 x 3/4 x 5/8
= 30
7.
賣了
100 x (1 - 8/25)
= 100 x (25/25 - 8/25)
= 100 x 17/25
= 68件
每件 1 1/2, 共賣得
68 x 1 1/2
= 68 x 3/2
= $102
8.
48kg x (1 - 1/4)
= 48kg x 3/4
= $36kg
9.
$5 x (1 - 1/5) x (1 - 3/4)
= $5 x 4/5 x 1/4
= $1 (分子分母相約便可)
10.
乙得
1 - 4/7
= 3/7
甲比乙多
126個 x (4/7 - 3/7)
= 126個 x 1/7
= 18個
a走了 250 x (2/5) = 100m
b走了 250 x (3/10) = 75m
a比b 走多了 100 - 75 = 25m
2.
$3000 (1 - 3/8 - 2/5)
= $3000 x (40/40 - 15/40 - 16/40)
= $3000 x (9/40)
= $675
3. 問題不大清楚
如第二天是用第一天餘下的1/3
$7200 x (1 - 1/2) x (1 - 1/3)
= $7200 x (1/2) x (2/3)
= $7200 x (1/3)
= $2400
如第二天是用原本的1/3
$7200 x (1 - 1/2 - 1/3)
= $7200 x (6/6 - 3/6 - 2/6)
= $7200 x (1/6)
= $1200
4.
36 x (1 + 3/4)
= 36 x (4/4 + 3/4)
= 36 x (7/4)
= 63本
5.
5/16 x 8/15 x 5/7
= 1/16 x 8/3 x 5/7 (頭兩項分子分母相約)
= 1/2 x 1/3 x 5/7 (頭兩項分子分母相約)
= 5/42
6.
64 x (1 - 1/4) x (1 - 3/8)
= 64 x 3/4 x 5/8
= 30
7.
賣了
100 x (1 - 8/25)
= 100 x (25/25 - 8/25)
= 100 x 17/25
= 68件
每件 1 1/2, 共賣得
68 x 1 1/2
= 68 x 3/2
= $102
8.
48kg x (1 - 1/4)
= 48kg x 3/4
= $36kg
9.
$5 x (1 - 1/5) x (1 - 3/4)
= $5 x 4/5 x 1/4
= $1 (分子分母相約便可)
10.
乙得
1 - 4/7
= 3/7
甲比乙多
126個 x (4/7 - 3/7)
= 126個 x 1/7
= 18個
收錄日期: 2021-04-19 00:28:36
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