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Fcr402
a fost răspuns

Rezolvati , in multimea numerelor naturale, ecuatiile:
2x+15=23
156-3x=18
7x+21=63
2x-11=37
9x+35=46
124-5x=69
4x-35=29
120-7x=57
15x+9=234
13x-39=169
12x+72=144
3x-11=145

Răspuns :

2x+15=23
2x=23-15
2x=8
x=8:2
x=4

156-3x=18
3x=156-18
3x=138
x=138:3
x=46

7x+21=63
7x=63-21
7x=42
x=42:7
x=6

2x-11=37
2x=37+11
2x=48
x=48:2
x=24

9x-35=46
9x=46+35
9x=81
x=81:9
x=9
tu ai scris +35 cred că era - că altfel nu îți dă


124-5x=69
5X=124-69
5X=55
x=55:5
x=11

4x-35=29
4x=29+35
4x=64
x=64:4
x=16

120-7x=57
7x=120-57
7x=63
x=63:7
x=9

15x+9=234
15x=234-9
15x=225
x=225:15
x=15

13x-39=169
13x=169+39
13x=208
x=208:13
x=16

12x+72=144
12x=144-72
12x=72
x=72:12
x=6

3x-11=145
3x=145+11
3x=156
x=156:3
x=52

Mult succes la școală
∅ Răspuns :


2x + 15 = 23 → 2x = 23 — 15 → 2x = 8 → x = 8 : 2 → x = 4


156 — 3x = 18 → 3x = 156 — 18 → 3x = 138 → x = 138 : 3 → x = 46


7x + 21 = 63 → 7x = 63 — 21 → 7x = 42 → x = 42 : 7 → x = 6


2x — 11 = 37 → 2x = 37 + 11 → 2x = 48 → x = 48 : 2 → x = 24


9x + 35 = 46 → 9x = 46 — 35 → 9x = 11 → x = 11 : 9 → x = 1,2


124 — 5x = 69 → 5x = 124 — 69 → 5x = 56 → x = 55 : 5 → x = 11


4x — 35 = 29 → 4x = 35 + 29 → 4x = 64 → x = 64 : 4 → x = 16


120 — 7x = 57 → 7x = 120 — 57 → 7x = 63 → x = 63 : 7 → x = 9


15x + 9 = 234 → 15x = 234 — 9 → 15x = 225 → x = 225 : 15 → x = 15


13x — 39 = 169 → 13x = 169 + 39 → 13x = 208 → x = 208 : 13 → x = 16


12x + 72 = 144 → 12x = 144 — 72 → 12x = 72 → x = 72 : 12 → x = 6


3x — 11 = 145 → 3x = 145 + 11 → 3x = 156 → x = 156 : 3 → x = 52


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