Реши уравнения и сделай проверку:
200 * x = 800;
y : 7 = 35;
84 : x = 6;
k * 5 = 450.
200 * x = 800
x = 800 : 200 = 8 : 2
x = 4
Проверка:
200 * 4 = 800
2 * 4 * 100 = 800
8 * 100 = 800
800 = 800
y : 7 = 35
y = 35 * 7 = (30 + 5) * 7 = 30 * 7 + 5 * 7 = 210 + 35
y = 245
Проверка:
245 : 7 = 35
(210 + 35) : 7 = 35
210 : 7 + 35 : 7 = 35
30 + 5 = 35
35 = 35
84 : x = 6
x = 84 : 6 = (60 + 24) : 6 = 60 : 6 + 24 : 6 = 10 + 4
x = 14
Проверка:
84 : 14 = 6
6 = 6
k * 5 = 450
k = 450 : 5 = 45 д : 5 = 9 д
k = 90
Проверка:
90 * 5 = 450
450 = 450