數學:
不好意,我有兩題數學的代數問題不會做,想請教大家,希望大家能幫幫忙.
Q1: 兩個數之差為10,若較小數的4倍與較大數的三分之一之和是25,求該兩個數.
Q2: 老師把X張貼紙平均分給8位小朋友,每位小朋友得5張貼紙,餘下3張,求貼紙的總數.
大家能幫幫忙吧!
數學及英文的問題
2006-10-15 7:48 am
回答 (3)
2006-10-15 11:58 am
Q1) Let the smaller no. be x, the larger no. be y
x + y = 10
x = 10 + y ------------(1)
4y + ( x/3 ) = 25
12( 4y + x/3 ) = 25*12
48y + 4x = 300
12y + x = 75 ---------------(2)
Sub (1) into (2),
12y + ( 10 + y ) = 75
13y = 65
y = 5
Sub y = 5 into (1),
x = 10 + 5
x = 15
Q2) No. of stickers
= 8 * 5 + 3
= 43
x + y = 10
x = 10 + y ------------(1)
4y + ( x/3 ) = 25
12( 4y + x/3 ) = 25*12
48y + 4x = 300
12y + x = 75 ---------------(2)
Sub (1) into (2),
12y + ( 10 + y ) = 75
13y = 65
y = 5
Sub y = 5 into (1),
x = 10 + 5
x = 15
Q2) No. of stickers
= 8 * 5 + 3
= 43
2006-10-15 7:56 am
Q1 . 設該該兩個數為X及Y.
X - Y = 10----------------(A)
4Y + X (1/3) = 25------------(B)
FROM (A) , X-Y=10
X = 10+Y-------(C)
INSERT (C) INTO (B),
4Y + X (1/3) = 25
4Y + (10+Y) (1/3) = 25
3 *[4Y + (10+Y) (1/3)] = 25*3
12Y + 10 + Y = 75
13Y = 75 - 10
Y = 65 / 13
Y = 5
2006-10-15 00:00:30 補充：
Q2. 貼紙的總數. = 8 * 5 + 3= 40 + 3= 43
X - Y = 10----------------(A)
4Y + X (1/3) = 25------------(B)
FROM (A) , X-Y=10
X = 10+Y-------(C)
INSERT (C) INTO (B),
4Y + X (1/3) = 25
4Y + (10+Y) (1/3) = 25
3 *[4Y + (10+Y) (1/3)] = 25*3
12Y + 10 + Y = 75
13Y = 75 - 10
Y = 65 / 13
Y = 5
2006-10-15 00:00:30 補充：
Q2. 貼紙的總數. = 8 * 5 + 3= 40 + 3= 43
收錄日期: 2021-05-02 14:22:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061014000051KK06873