Question

34 баллов.
Решите уравнения:

t + 2 11/52 = 7 5/39

8 7/9 - x = 7 8/9

Answer 1

$t + 2 frac{11}{52} = 7 frac{5}{39} \ t = 7 frac{5}{39} - 2 frac{11}{52} \ t = 5 + ( frac{5}{3 times 13} - frac{11}{4 times 13} ) \ t =5 + frac{20 - 33}{4 times 3 times 13} \ t = 5- frac{1}{12} \ t =4 frac{11}{12}$
$8 frac{7}{9} - x = 7 frac{8}{9} \x = 8 frac{7}{9} - 7 frac{8}{9} \ x = 1 + frac{7}{9} - frac{8}{9} \ x = 1 - frac{1}{9} \ x = frac{8}{9}$

Answer 2

1)
t+115/52=278/39
t=278/39-115/52
t=59/12 = 4 11/12

2)
79/9-x=71/9
-x=71/9-71/9
-x=-8/9
x=8/9