Решение уравнений

a) 25 × 4 × x = 900

100 × x = 900

x = 900 / 100

x = 9

б) 5 × y × 20 = 400

100 × y = 400

y = 400 / 100

y = 4

в) p × 9 × 23 = 207

p × 207 = 207

p = 207 / 207

p = 1

г) 2 × m × 45 = 810

90 × m = 810

m = 810 / 90

m = 9

Ответ: a) x = 9; б) y = 4; в) p = 1; г) m = 9