Question

думаю всё видно,Поможете?​

Answer 1

Ответ:

$76 \times x = 38 \times 50 \\\ 76x = 1750 \\ 76x \div 76 = 1750 \div 76 \\ x = 1750 \div 76 \\ x = \frac{1750}{76 } \\ x = \frac{875}{38 } \\ x = 23 \frac{1}{38}$

$2)12 \times (x + 9x) = 480 \\ 12(x + 9x) \div 12 = 480 \div 12 \\ \frac{12x + 9x}{12} = 480 \div 12 \\ x + 9x = 40 \\ 10x = 40 \\ x = 40 \div 10 \\ x = 4$

$3)456 + 768 + a = 1567 + 765 \\ 1224 + a = 2332 \\ a = 2332 - 1224 \\ a = 1108$

$4)5x + 3x - 200 = 1000 \\ 8x - 200 = 1000 \\ 8x = 1000 + 200 \\ 8x = 1200 \\ x = 1200 \div 8 \\ x = 150$