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

х = 6

Answer 3

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

Проверка:

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