A múlt heti házi feladatok megoldása: 7. osztály 2021.03.08. Hétfő
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1152. a) 3X + 2 = 8 b) 2X – 3 = 11 c) 5X + 7 = 42 d) 6X – 1 = 35
3X = 6 2X = 14 5X = 35 6X = 36
X = 2 X = 7 X = 7 X = 6
e) 3X- 2 = 4 f) 5X + 4 = 19 g) 7X + 30 = 240 h) 4X -5 = 35 i) 8X + 3 = 123
3X = 6 5X = 15 7X = 210 4X = 40 8X = 120
X = 2 X = 3 X = 30 X = 10 X = 15
1153. a) 3X – 7 = 8 b) 3X + 5 = 2 c) 9X + 2 = -79 d) 4X + 3 = 2
3X = 15 3X = -3 9X = -81 4X = -1
X = 5 X = -1 X = -9 X = -1/4
e) 9X -1 = -28 f) 6X + 1 = -7
9X = -27 6X = -8
X = -3 X = -8/6
A múlt heti házi feladatok megoldása: 7. osztály 2021.03.09. Kedd
1156. a) 9X -1 = 26 b) 8X – 9 = 71 c) 8X – 29 = 71 d) 6X + 3 = 147
9X = 27 8X = 80 8X = 100 6X = 144
X = 3 X = 10 X = 12,5 X = 24
e) 3X – 5 = 34 f) 8X + 1 = 65 g) 19X – 3 = 510 h) 3X -12 = 0
3X = 39 8X = 64 19X = 513 3X = 12
X = 13 X = 8 X = 27 X = 4
i) 4X + 11 = 55 j) 3X -7 = 35 k) 7X + 11 = 88 l) 5X + 15 = 0
4X = 44 3X = 42 7X = 77 5X = -15
X = 11 X = 14 X = 11 X = -3
1154. a) 2X + 3 = 13 b) 6X + 1 = 25 c) 7X + 3 = 17
2X = 10 6X = 24 7X = 14
X = 5 X = 4 X = 2
A múlt heti házi feladatok megoldása: 7. osztály 2021.03.10. Szerda
1157.a) 2X +3 = 1 b) 5X + 16 = 1 c) 3X + 12 = 0 d) 9X -1 = 17
2X = -2 5X = -15 3X = -12 9X = 18
X = -1 X = -3 X = -4 X = 2
e) 20X + 70 = 10 f) 4X -3 = 5
20X = -60 4X = 8
X = -3 X = 2
1158. a) 6x + 8 = -4 b) 3X -2 = -23 c) 5X – 1 = -21 d) 13X + 9 = -160
6X = -12 3X = -21 5X = -20 13X = -169
X = -2 X = -3 X = -4 X = -13
e) 11X – 2 = 119 f) 12X + 7 = 151
11X = 121 12X = 144
X = 11 X = 12
1159. a)2X -4 = 12 b) 5X + 9 = 6 c) 2X – 9 = -9 d)3X + 4 = -8
2X = 16 5X = -3 2X = 0 3X = -12
X = 8 X = -3/5 X = 0 X = -4
e) 10X -12 = -2 f) -6X + 2 = 32
10X = 10 -6X = 30
X = 1 X = -5
A múlt heti házi feladatok megoldása: 7. osztály 2021.03.12. Péntek
1223. a) 2X +1 <7 b) 4X - 2 ≤ 6 c) 3X + 2 > 8 d) 5X – 1 > 14
2X < 6 4X ≤ 8 3X > 6 5X > 15
X < 3 X ≤ 2 X > 2 X > 3
e) 3X – 1 > 6 f) 5X + 2 ≥ 9 g) 2X + 6 ≤ 13 h) 4X – 1 < 10
3X > 7 5X ≥ 7 2X ≤ 7 4X < 11
X > 7/3 X ≥ 7/5 X ≤ 3,5 X < 11/4