Решите уравнение: 1) x + x + 86 = 78 2) (x+ 20) • 10 = 700 3) 8 • (36 + x) = 1288 4) (x...

Пошаговое объяснение:

$x + x + 86 = 78 \\ 2x \div 86 = 78 \\ 2x = 78 - 86 \\ 2x = - 8 \\ x = - 8 \div 2 \\ x = - 4$

$(x + 20) \times 10 = 700 \\ x + 20 = 700 \div 10 \\ x + 20 = 70 \\ x = 70 - 20 \\ x = 50$

$8 \times (36 + x) = 1288 \\ 36 + x = 1288 \div 8 \\ 36 + x = 161 \\ x = 161 - 36 \\ x = 125$

$(x - 65) \times 5 = 400 \\ x - 65 = 400 \div 5 \\ x - 65 = 80 \\ x = 80 + 65 \\ x = 145$

$( x - 84) \times 11 = 176 \\ x - 84 = 176 \div 11 \\ x - 84 = 16 \\ x = 16 + 84 \\ x = 100$