Question

уравнение плз
3x= 2 1/7, 3/4x=1/2 ,1,3x=-1,69,10x=0,5

Answer 1

1)

$3 x = 2 \frac{1}{7} \\ 3x = \frac{15}{7} \\ 3x \times 7 = 15 \\ 21x = 15 \\ x = \frac{15}{21} = \frac{5}{7}$

2)

$\frac{3}{4} x = \frac{1}{2} \\ 3x \times 2 = 4 \times 1 \\ 6x = 4 \\ x = \frac{4}{6} = \frac{2}{3}$

3)

$1.3x = - 1.69 \\ x = - \frac{1.69}{1.3} = - \frac{169}{130} = \frac{13}{10} = 13$

4)

$10x = 0.5 \\ x = \frac{0.5}{10} = \frac{5}{100} = 0.05$