ร16-64

ab b − a R+
a −b R+
ab
7−5 = 2 2 R+
1 1. 5  7 6 R+
2. 0  6 6−0=6 3 R+
3. 2  −1 3 R+
4. − 2  −5 2 − (−1) = 3
− 2 − (− 5) = 3

ab a = b, a  b a  b

ab a b
ab a b
abc
abc ab bc
abc ab bc
abc ab bc
ab bc

2 2 3
2 1
3
1. 2  3 1< 2 2<3
2. 2  1 1 2 23
3. 1 < 2 < 3 1< 2
4. 1  2  3 1 2 22
5. 1 < 2  2 2<4
6. 1  2 < 4

1. bc ac 4>3 3>2 4>2

ab 3>2 3+1>2+1

2.

ab a+c b+c

3.

1 ab c0 ac  bc 4 > 3 2 > 0 4(2) > 3(2)
ac  bc 4 > 3 -2 < 0 4(-2) < 3(-2)
2 ab c0

4.

a+c b+c ab 4 +2 > 3 +2 4 > 3

5. c0 a  b 4(2) > 3(2) 4 > 3 2>0
1 ac  bc c0 a  b 4(-2) > 5(-2) 4 < 5 -2 <> 0
2 ac  bc

6. cd a+cb+d 2<3 4<5 2+4<3+5

ab

5. c  0 a  b 4(2) > 3(2) 4 > 3 2 > 0
1 ac  bc c  0 a  b 4(-2) > 5(-2) 4 < 5 -2 > 0
2 ac  bc

16.. cbdc aa+cc b + d 24<>33 4 < 35 > 2 2 + 4 <43>+25

aabb

2. ca+dc  b + c a − d  b − c 23 <> 32 4 < 53 + 1 >22- +5 <1 3 - 4

aabb

3. aaccbbdc 0-344<<>>-2233<<0 3 -22->5<0<00-<4<4 < 5 44((2-(2-)3)>)2<(-(3543())2(-><)2)(3-2(5)()-4)
01 a  ba  b 0  c c d 0 aacc  bbdc 0
a2 b  0a  b c  d c 0 0

4. 0ab 0cd a b 04<+22 <> 33 +2 0 <44><35 23
dc 54
a+c b+c ab

5. ab0 cd 0 a  b -3 < -2 < 0 -5 < -4 < 0 − 3  − 2
dc 4 > 3 2 −>40 − 5
1 ac  bc c0 ab 4(2) > 3(2)

2 ac  bc c  0 a  b 4(-2) > 5(-2) 4 < 5 -2 > 0

6. cd a+cb+d 2<3 4<5 2+4<3+5

ab

1. a,b,c d

1) a  b a2  b2

2) a  0,b  0 a  b 11
ab

3) a  b − a  −b

4) a  0 b  0 ab  0

5) a  0 b  0 ab  0

6) a  0 1 0
a