A:2(x+1)>4
B:7x-9>9x+7
solve the following inequalities
2007-07-08 3:16 am
回答 (4)
2007-07-08 3:21 am
✔ 最佳答案
2 ( x + 1 ) > 4x + 1 > 2
x > 1
7x - 9 > 9x + 7
-16 > 2x
2x < -16
x < -8
參考: My Maths Knowledge
2007-07-09 1:00 am
A: 2(x+1)>4
2(x+1)/2>4/2 (Divide both sides by 2)
x+1>2
x+1-1>2-1 (subtract both sides by 1)
so x>1
B: 7x-9>9x+7
7x-9+9>9x+7+9 (Add both sides by 9)
7x>9x+16
7x-9x>9x-9x+16 (subtract both sides by 9x)
-2x>16
-2x/-2 >16/-2 (divide both sides by -2)
so x<-8
2(x+1)/2>4/2 (Divide both sides by 2)
x+1>2
x+1-1>2-1 (subtract both sides by 1)
so x>1
B: 7x-9>9x+7
7x-9+9>9x+7+9 (Add both sides by 9)
7x>9x+16
7x-9x>9x-9x+16 (subtract both sides by 9x)
-2x>16
-2x/-2 >16/-2 (divide both sides by -2)
so x<-8
2007-07-08 4:45 am
A. 2 (x + 1) > 4
x + 1 > 2
x > 1
B. 7x - 9 > 9x + 7
7x - 9x > 7 + 9
-2x > 16
x < -8
x + 1 > 2
x > 1
B. 7x - 9 > 9x + 7
7x - 9x > 7 + 9
-2x > 16
x < -8
2007-07-08 3:22 am
2(x+1)>4
x+1>2
x>1
7x-9>9x+7
-2x>16
x<-8
x+1>2
x>1
7x-9>9x+7
-2x>16
x<-8
收錄日期: 2021-04-23 21:57:35
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