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510 +14x = 762;
3(x + 7) = 75;
14(12 − x) = 70;
111+2x+29=10^3
5x+52-31=30^2-19;
(10^3= 10 la puterea a treia, 30^2= 30 la puterea a doua)
Va rog repede, dau corana, si 5 stelute
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Răspuns:
1. 14x = 762 - 510
14x = 252
x = 252 : 14
x = 18
2. 3× x + 3×7 = 75
3x + 21 = 75
3x = 75 - 21
3x = 54
x = 54: 3
x = 18
3. 14 × 12 -14 x = 70
168 - 14x = 70
- 14 x = 70 - 168
- 14 x = - 98 | × (-1)
14 x = 98
x = 98: 14
x= 7
4. 111+ 2x + 29 = 1000
2x = 1000 - 29 - 111
2x = 860
x =860:2
x = 430
5. 5x +52 - 31 = 900 -19
5x= 900- 19 - 52 +31
5x = 860
x = 860: 5
x = 172