213 Решите уравнение: a) 25.4.x = 900; б) 5.у. 20 = 400; в) р.9.23 = 207; г) 2. m. 45 = 810.

a) 25 × 4 × x = 900

100x = 900

x = 900 / 100

x = 9

б) 5 × y × 20 = 400

100y = 400

y = 400 / 100

y = 4

в) p × 9 × 23 = 207

207p = 207

p = 207 / 207

p = 1

г) 2 × m × 45 = 810

90m = 810

m = 810 / 90

m = 9