Question

[Trà Sữa Nhỏ]

Câu hỏi : Tìm x:

2.x+3,(78)=2,(3)

Answer 1

[Lê Trần Minh Anh]

Ta có : \(3,\left(78\right)=3+0,\left(78\right)=3+\frac{78}{99}=\frac{375}{99}\)

            \(2,\left(3\right)=2+0,\left(3\right)=2+\frac{3}{9}=\frac{7}{3}\)

\(\Rightarrow2x+\frac{375}{99}=\frac{7}{3}\)

                    \(2x=\frac{7}{3}-\frac{375}{99}\)

                    \(2x=-\frac{144}{99}\)

                \(\Rightarrow x=-\frac{8}{11}\)

Answer 2

[Vũ Bách Quang]

2.x+3,(78)=2,(3)

2.x=2,(3)-3,(78)

2.x=-228

x=-288-2

x=-114