5.28 Найдите корень уравнения: a) 7,2 – (z – 6,1) = 6,3; б) –2,9 + (у – 5,3) = −3,4; в) 4,4 – (а – 5,6) = 100; г) -8/9 – (n – 1) = 7/18; д) 1 5/9 – (s + 4/9) = 2/3; е) -5 4/7 + (-5/14 + z) =

7.2 – (z – 6.1) = 6.3

7.2 – z + 6.1 = 6.3

13.3 – z = 6.3

z = 13.3 – 6.3

z = 7

–2.9 + (y – 5.3) = −3.4

–2.9 + y – 5.3 = −3.4

y – 8.2 = −3.4

y = −3.4 + 8.2

y = 4.8

4.4 – (a – 5.6) = 100

4.4 – a + 5.6 = 100

10 – a = 100

–a = 100 – 10

–a = 90

a = –90

-\frac{8}{9} - (n - 1) = \frac{7}{18}

-\frac{8}{9} - n + 1 = \frac{7}{18}

-n = \frac{7}{18} + \frac{8}{9} - 1

-n = \frac{7}{18} + \frac{16}{18} - \frac{18}{18}

-n = \frac{7 + 16 - 18}{18}

-n = \frac{5}{18}

n = -\frac{5}{18}

1\frac{5}{9} – (s + \frac{4}{9}) = \frac{2}{3}

\frac{14}{9} – s - \frac{4}{9} = \frac{2}{3}

\frac{10}{9} – s = \frac{2}{3}

–s = \frac{2}{3} - \frac{10}{9}

–s = \frac{6}{9} - \frac{10}{9}

–s = -\frac{4}{9}

s = \frac{4}{9}