Question

Решите уравнение:
1) x + x + 86 = 78
2) (x+ 20) • 10 = 700
3) 8 • (36 + x) = 1288
4) (x - 65) • 5 = 400
5) (x - 84) • 11 = 176

Answer 1

Пошаговое объяснение:

1)

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

2)

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

3)

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

4)

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

5)

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