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2x ≤ 10
x ≤ 5
2. 3-x/2 ≤7 |*2
6-x ≤ 14
-x ≤ 20
x ≤ -20
3. trzy drugie x+ pięć drugich > 2
trzy drugie x > - jedna druga
x > jedna trzecia
4. 2x+2 < 4x
2 < 2x
1 < x
2(x-3)≤4
2x-6≤4
2x≤10
x≤5
2.
(6-x):2≤7
(6-x)*½≤7
3-½x≤7
-½x≤4 /*(-2)
x≥-8
3.
½(3x+5)>2
3/2x+5/2>2 /*2
3x+5>4
3x>-1
x>⅓
4,
2(x+1)<4x
2x+2<4x
-2x<-2
x>1
2. (6-x) :2≤7
3. Jedna druga(3x+5)>2
4. 2(x+1)<4x
Odpowiedzi:
1.
2(x-3)≤4
2x-6≤4
2x≤10
x≤5
2.
(6-x):2≤7
(6-x)*½≤7
3-½x≤7
-½x≤4 /*(-2)
x≥-8
3.
½(3x+5)>2
3/2x+5/2>2 /*2
3x+5>4
3x>-1
x>⅓
4,
2(x+1)<4x
2x+2<4x
-2x<-2
x>1