Question

1)25x-1=9
2)7х+8=11
3)3х-5=10-х
4)4х=4=х+5

даю 50 баллов

Answer 1

Ответ:

1)

$25x - 1 = 9 \\ 25x = 9 + 1 \\ 25x = 10 \div 25 \\ x = \frac{2}{5} = 0.4$

2)

$7x + 8 = 11 \\ 7x = 11 - 8 \\ 7x = 3 \div 7 \\ x = \frac{3}{7}$

3)

$3x - 5 = 10 - x \\ 3x + x = 10 + 5 \\ 4x = 10 + 5 \\ 4x = 15 \div 4 \\ x = \frac{15}{4} = 3 \frac{3}{4} = 3.75$

4)

$4 x + 4 = x + 5 \\ 4x - x = 5 - 4 \\ 3x = 5 - 4 \\ 3x = 1 \div 3 \\ x = \frac{1}{3}$