Question

Решите уравнение
$4 - y = - 2 \frac{2}{3}$
$z + 0.4 = - 1 \frac{2}{3}$
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Answer 1

1) 4 - y = - 2(2/3)

-y = -2(2/3) - 4

-y = -6(2/3)

y = 6(2/3)

2) z + 0.4 = -1(2/3)

z = -1(2/3) - 0.4

Представим всё в виде дробей:

z = -5/3 - 4/10

приведем к общ. знаменателю:

z = -50/30 - 12/30

z = (-50 -12)/30

z = -62/30

z = -31/15

z = 2(1/15)