Question

. 9x=2/5; 2) 3x=2 1/7; 3) 1/2x=3; 4) 3/4x=1/2

Answer 1

1)

$9x = \frac{2}{5} \\ \frac{9}{1}x = \frac{2}{5} \\ x = \frac{2}{5} \div \frac{9}{1} \\ x = \frac{2}{5} \times \frac{1}{9} \\ x = \frac{2}{45}$

2)

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

3)

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

4)

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