Toán Lớp 7: Properties of Inequality
1. 3(2???? − 3) > 18
2. (3???? + 5) + (4???? − 1) > 4???? − 3
3. 5 − 8???? < 2(5 − 8????)
4. −(2 + 3????) ≤ 3(2???? + 1)
5. (3???? + 6) − (3???? + 4) < 2???? + 7
6. 5(1 + 4????) ≥ 2(???? − 1)
7. 14 + 5???? < 2(9???? + 1)
8. 2???? + 5 < 9
9. 4(3???? − 1) < 20
10. 18 + 4???? ≤ 3(6 + ????)
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Comments ( 1 )
2n-3 > 18/3
2n-3>6
2n>6+3
2n>9
n>9/2
2)
3p+5+4p-1>4p-3
3p+5-1>-3
3p>-3-4
3p=-7/3
p=-7/3
3)
5-8m<10-16m
-8m<10-16m-5
-8m+16m<5
8m<5
m=5/8
4)
-2-3s ≤ 3(2s+1)
-2-3s≤6s+3
-3s≤6s+5
-3s-6s≤5
-9s≤5
s≥-5/9
5)
3p+6-3p-4<2p+7
2<2p+7
2-7<2p
-5<2p
-5/2<p
p>-5/2
6)
5+20s ≥2x-2
5+20s-2x ≥-2
5+18s ≥-2
18s ≥-2-5
18s ≥-7
s ≥-7/18
7)
14+5t<18t+2
14<18t+2-5t
14<13t+2
14-2<13t
12<13t
12/23<t
8)
2m<9-5
2m<4
m<4/2
m<2
9)
3n-1<20/4
3n<5+1
3n<6
n=6/3
n<2
10)
18+4t ≤18+3t
4t≤3t
4t-3t≤0
t≤0