Question

решите уравнение (5/6 *х-1,1)*0,8=5/6*х-1,98

Answer 1

$( frac{5}{6} x - 1.1) times 0.8 = frac{5}{6} x - 1.98 \ frac{5 times 4}{6 times 5} x - 0.88 - frac{5}{6} x = - 1.98 \ frac{4 - 5}{6} x = - 1.98 + 0.88 \ - frac{1}{6} x= - 1.1 : : : : : | times ( - 6) \ x = 6.6$
проверим:

$( frac{5}{6} times 6.6 - 1.1) times 0.8 = frac{5}{6} times 6.6 - 1.98 \ ( frac{5 times 66}{6 times 10} - 1.1) times 0.8 = frac{5 times 66}{6 times 10} - 1.98 \ (frac{11}{2} - 1.1) times 0.8 = frac{11}{2} - 1.98 \ (5.5 - 1.1) times 0.8 = 5.5 - 1.98 \ 4.4 times 0.8 = 3.52 \ 3.52 = 3.52$