1/7x*2целых 4/5=4/5 -4*(x+8)-2=-3(5-x) - вопрос №7808060172454548235 от sofiiishtepa 16.02.2020 14:55

Question

Математика: 1/7x*2целых 4/5=4/5 -4*(x+8)-2=-3(5-x)

sofiiishtepa · Answer

1/7х * 2 4/5 = 4/51/7х * 14/5 = 4/51/7х = 4/5 : 14/5 = 4/5 * 5/14 = 4/14 = 2/7х = 2/7 : 1/7 = 2/7 * 7/1 = 2х = 2Проверка: (1/7 * 2) * 2 4/5 = 2/7 * 14/5 = (2*2)/(1*5) = 4/5- 4 * (х + 8) - 2 = - 3 * (5 - х)- 4х - 32 - 2 = - 15 + 3х- 4х - 3х = - 15 + 32 + 2- 7х = 19х = 19 : (-7) = - 19/7х = - 2 целых 5/7...