1.There are 2 consecutive positive odd number.The sum of the smaller number
and one-third of the lager number is less than or equal to 10.Find the greatest
of the smaller number.
2.x is greater than y by5,and the sum of x and y is less than 49.Find the
largerest value of x if x is integer.
問2題數學題
2007-05-03 11:51 pm
回答 (2)
2007-05-04 12:12 am
✔ 最佳答案
1. let the two numbers be 2x+1, 2x+3(2x+3)/3+2x+1<=10
2x+3+6x+3<=30
8x<=24
x<=3
Thus, the greatest of the smaller number = 2*3+1 = 7
2. x+5=y, x+y<49
2x+5<49
2x<44
x<22
Thus, the largest value of x is 21
2007-05-03 16:21:19 補充：
睇錯...x is greater than y by5, 即y 5=x2. 2x-5
2007-05-03 17:59:33 補充：
y加5=xthe largest value of x is 26
2007-05-04 12:14 am
Q1 Answer:
Let x be the smaller number and x+2 be the larger number
x + 1/3 *(x+2) <= 10
(4/3)*x + 2/3 <= 10
(4/3)*x <= 28/3
x<= 7
then the largest value for x is 7
Q2 Answer:
Solve the below two equations -----
x-y = 5 ..............................(1)
and x+y <49 ........................(2)
From (1), y = x-5
sub into (2),
x+(x-5) < 49
2x-5<49
2x<54
x<27
then the largest value for x is 26 as 26<27 and is an integer
Let x be the smaller number and x+2 be the larger number
x + 1/3 *(x+2) <= 10
(4/3)*x + 2/3 <= 10
(4/3)*x <= 28/3
x<= 7
then the largest value for x is 7
Q2 Answer:
Solve the below two equations -----
x-y = 5 ..............................(1)
and x+y <49 ........................(2)
From (1), y = x-5
sub into (2),
x+(x-5) < 49
2x-5<49
2x<54
x<27
then the largest value for x is 26 as 26<27 and is an integer
收錄日期: 2021-04-13 14:41:14
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