Question

решите пж уравнения полностью в тетради​

Answer 1

21/4х=7/8

х=7/8:21/4

х=7/8*4/21

$\frac{7}{8} \times \frac{4}{21} = \frac{1}{6}$

Answer 2

$5 \frac{1}{4} \div x = \frac{7}{8} \\ x = 5 \frac{1}{4} \div \frac{7}{8} \\ x = \frac{21}{4} \times \frac{8}{7} \\ x = 6$

Проверка:

$5 \frac{1}{4} \div 6 = \frac{7}{8} \\ \frac{21}{4} \times \frac{1}{6} = \frac{7}{8} \\ \frac{7}{8} = \frac{7}{8}$