14 2/5*(-19/54)*15/38: х=-2 2/31*12 2/5*15/32

Question

Математика: 14 2/5*(-19/54)*15/38: х=-2 2/31*12 2/5*15/32

JANNETA2010 · Answer

14 2/5*(-19/54)*15/38:х=-2 2/31*12 2/5*15/32
1)14 2/5*(-19/54)=72/5*(-19/54)=36/5*(-19/27)=4/5*(-19/3)=-76/15

2) - 76/15 * 15/38 = - 76/38=-2

-2:х-левая часть

3) - 2 2/31 * 12 2/5 = - 64/31 * 62/5 = - (64*2)/5 = - 128/5 = - 25 3/5

4) - 128/5 * 15/32 = - (4*3)/1 = - 12 - правая часть уравнения

Уравнение: - 2 : х = - 12

х = - 2 : (- 12)

х = 2/12 = 1/6

Проверка: - 2 : 1/6 = - 2 * 6/1 = - 12

ответ: х = 1/6.

14 2/5(-19/54)15/38: х=-2 2/3112 2/515/32