Question

Помогите решить пожалуста .1 1/2× 1 1/3; 2 1/3×1 1/2; 3 1/3×1 1/7; 12 1/2×1 1/5; 3 1/3× 2 2/7 ; 1 4/5× 1 1/9;

Answer 1

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

$2 \frac{1}{3 } \times 1 \frac{1}{2} = \frac{7}{3} \times \frac{3}{2} = \frac{7 \times 3}{3 \times 2} = \frac{7 \times 1}{1 \times 2} = \frac{7}{2} = 3 \frac{1}{2} = 3.5$

$3 \frac{1}{3} \times 1 \frac{1}{7} = \frac{10}{3} \times \frac{8}{7} = \frac{10 \times 8}{3 \times 7} = \frac{80}{21} = 3 \frac{17}{21}$

$12 \frac{1}{2} \times 1 \frac{1}{5} = \frac{25}{2} \times \frac{6}{5} = \frac{25 \times 6}{2 \times 5} = \frac{5 \times 3}{1 \times 1} = 15$

$3 \frac{1}{3} \times 2 \frac{2}{7} = \frac{10}{3} \times \frac{16}{7} = \frac{160}{21} = 7 \frac{13}{21}$

$1 \frac{4}{5} \times 1 \frac{1}{9} = \frac{9}{5} \times \frac{10}{9} = \frac{9 \times 10}{5 \times 9} = \frac{1 \times 2}{1 \times 1} = 2$