Question

Реши уравнения:
1. (у - 264) - 100 = 36;
2. 800 + (х-120) = 1000;
3. (х + 20) - 10 = 700;
4. 250 - (175-у) = 125;
5. 6. (18-k) = 54;
6. (x-65) - 5= 400;
7. 3. (2х- 9) = 27;
8. 9. (5х +8)= 207;
9. (410 - d) :7+ 70 = 120.

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Answer 1

Ответ:

$y - 264 - 100 = 36 \\ y = 36 + 264 + 100 \\ y = 400$

$800 + x - 120 = 1000 \\ x = 1000 - 800 + 120 \\ x = 320$

$x + 20 - 10 = 700 \\ x = 700 - 10 \\ x = 690$

$250 - 175 + y = 125 \\ y = 125 - 250 + 175 \\ y = 50$

$6(18 - k) = 54 \\ 18 - k = 9 \\ k = 9$

$x - 65 - 5 = 400 \\ x - 70 = 400 \\ x = 470$

$3(2x - 9) = 27 \\ 2x - 9 = 9 \\ 2x = 18 \\ x = 9$

$9(5x + 8) = 207 \\ 5x + 8 = 23 \\ 5x = 15 \\ x = 3$

$(410 - d) \div 7 = 120 - 70 \\ (410 - d) \div 7 = 50 \\ 410 - d = 7 \times 50 \\ 410 - d = 350 \\ d = 60$