10×3/23×10,10×2/21×30,4×5/15×16,8×9/27×16 сократите обыкновенные дроби HELLP

Решите задачу:

$\frac{10 \times 3}{23 \times 10} = \frac{3}{23 } \\ \frac{10 \times 2}{21 \times 30} = \frac{2}{21 \times 3} = \frac{2}{63} \\ \frac{4 \times 5}{15 \times 16} = \frac{1}{3 \times 4} = \frac{1}{12} \\ \frac{8 \times 9}{27 \times 16} = \frac{1}{3 \times 2} = \frac{1}{6}$