1. -2(3а - 4) - 3(1 + 2а) + 2а = -6а + 8 - 3 - 6а + 2а = 5 - 10а
2. 2а - 3 = 2.5а - 1
0.5а = -2
а = -4
3. -0.5х + 2 = -3 + 2х
2.5х = 5
х = 2
у = -3 + 2х = -3 + 4 = 1
(2; 1)
4. 24а³в⁵с⁵÷(-0.8ав³с⁵) = -30а²в²
5. 8³ × 16⁴/32⁵ = 8⁷ × 2⁴/8⁵×2¹⁰ = 1
6. 1.8⁶
7. 7³ × 7¹¹ ÷ 7¹³ = 7¹⁴ ÷ 7 ¹³ = 7¹
8. 3а-⁵ = 3/а⁵
9. -5а⁸/4 = -1.25а⁸
10. 3х² - 1.2х = 0
1.2х(2.5х - 1) = 0
х1 = 0, х2 = 0.4
11. (3х²у)³ × 5у⁷ = 27х⁶у³ × 5у⁷ = 135х⁶у¹⁰
12. 2в × (-3с) = -6вс
13. 3mn - 4mk = m(3n - 4k)
14. 9уу²у = 9у⁴
15. 1000 = 10³
1. -2(3а - 4) - 3(1 + 2а) + 2а = -6а + 8 - 3 - 6а + 2а = 5 - 10а
2. 2а - 3 = 2.5а - 1
0.5а = -2
а = -4
3. -0.5х + 2 = -3 + 2х
2.5х = 5
х = 2
у = -3 + 2х = -3 + 4 = 1
(2; 1)
4. 24а³в⁵с⁵÷(-0.8ав³с⁵) = -30а²в²
5. 8³ × 16⁴/32⁵ = 8⁷ × 2⁴/8⁵×2¹⁰ = 1
6. 1.8⁶
7. 7³ × 7¹¹ ÷ 7¹³ = 7¹⁴ ÷ 7 ¹³ = 7¹
8. 3а-⁵ = 3/а⁵
9. -5а⁸/4 = -1.25а⁸
10. 3х² - 1.2х = 0
1.2х(2.5х - 1) = 0
х1 = 0, х2 = 0.4
11. (3х²у)³ × 5у⁷ = 27х⁶у³ × 5у⁷ = 135х⁶у¹⁰
12. 2в × (-3с) = -6вс
13. 3mn - 4mk = m(3n - 4k)
14. 9уу²у = 9у⁴
15. 1000 = 10³