Question

Решить уравнения x*2 1/2=1; 3/10*x=1 1/9; 3*x=5

Answer 1

$1) \: x \times 2 \frac{1}{2} = 1 \\ \\ x \times \frac{5}{2} = 1 \\ \\ \frac{5}{2} x = 1 \\ \\ x = 1 \div \frac{5}{2} = 1 \times \frac{2}{5} \\ \\ x = \frac{2}{5} \\ \\ otvet :x = \frac{2}{5}$

$2) \: \frac{3}{10} \times x = 1 \frac{1}{9} \\ \\ \frac{3}{10} x = \frac{10}{9} \\ \\ \\ x = \frac{10}{9} \div \frac{3}{10} = \frac{10}{9} \times \frac{10}{3} = \frac{10 \times 10}{9 \times 3} \\ \\ \\ x = \frac{100}{27} \\ \\ otvet : x = \frac{100}{27}$

$3) \: 3 \times x = 5 \\ \\ 3x = 5 \\ \\ x = 5 \div 3 \\ \\ x = \frac{5}{3} \\ \\ otvet : x = \frac{5}{3}$

Правильно вниз , верху он неправильно решил!