Question

tìm y , biết:

2/15 : y = 8/5-2/5

giúp tui ik

Answer 1

Nhớ quy tắc:

x : y = ...

=> y = x: ...

=> x = ... nhân y

Tương tự áp dụng với cách làm suy ra:

y = 2/ 15 : (8/5 - 2/5)

Answer 2

\(\dfrac{2}{15}:y=\dfrac{8}{5}-\dfrac{2}{5}\)

\(\dfrac{2}{15}:y=\dfrac{6}{5}\)

\(y=\dfrac{2}{15}:\dfrac{6}{5}\)

\(y=\dfrac{2}{15}\times\dfrac{5}{6}\)

\(y=\dfrac{1}{9}\)

Answer 3

\(\dfrac{2}{15}:y=\dfrac{8}{5}-\dfrac{2}{5}\)

\(\dfrac{2}{15}:y=\dfrac{6}{5}\)

\(y=\dfrac{2}{15}:\dfrac{6}{5}\)

\(y=\dfrac{90}{10}=9\)

Answer 4

nhầm làm lại

\(\dfrac{2}{15}:y=\dfrac{8}{5}-\dfrac{2}{5}\)

\(\dfrac{2}{15}:y=\dfrac{6}{5}\)

\(y=\dfrac{2}{15}:\dfrac{6}{5}\)

\(y=\dfrac{10}{90}=\dfrac{1}{9}\)