\(\left(a\right)\dfrac{5}{3}-\dfrac{1}{2}:x=\dfrac{2}{7}\\ \dfrac{1}{2}:x=\dfrac{5}{3}-\dfrac{2}{7}=\dfrac{29}{21}\\ x=\dfrac{1}{2}:\dfrac{29}{21}=\dfrac{21}{58}\\ \left(b\right)\dfrac{1}{4}\cdot x+\dfrac{7}{5}=\dfrac{5}{3}\\ \dfrac{1}{4}\cdot x=\dfrac{5}{3}-\dfrac{7}{5}=\dfrac{4}{15}\\ x=\dfrac{4}{15}:\dfrac{1}{4}=\dfrac{16}{15}\\ \left(c\right)5\cdot x-2024=3\cdot x\\ 5\cdot x-3\cdot x=2024\\ x\cdot\left(5-3\right)=2024\\ x\cdot2=2024\\ x=2024:2=1012\)

a) 

Có : 990 ml + 9 ml + 1 ml = 1000 ml = 1 l

Vậy chọn B.

B.1

\(\dfrac{x}{8}\) + \(\dfrac{2}{3}\) = \(\dfrac{7}{6}\)

 \(\dfrac{x}{8}\)        = \(\dfrac{7}{6}\) - \(\dfrac{2}{3}\)

  \(\dfrac{x}{8}\)       = \(\dfrac{1}{2}\) 

   \(x\)        = \(\dfrac{1}{2}\) x 8 

    \(x\)       = 4

\(\dfrac{x}{8}+\dfrac{2}{3}=\dfrac{7}{6}\)

        \(\dfrac{x}{8}=\dfrac{7}{6}-\dfrac{2}{3}\)

        \(\dfrac{x}{8}=\dfrac{1}{2}=\dfrac{4}{8}\)

⇒ x = 4

Vậy x = 4

\(\overline{ab8}+\overline{ab}=949\\ \overline{ab}\times10+8+\overline{ab}=949\\\overline{ab} \times\left(10+1\right)=949-8\\ \overline{ab}\times11=941\\ \overline{ab}=941:11\\ \overline{ab}=941:11\\ \overline{ab}=\dfrac{941}{11}\) 

Mà: ab là số tự nhiên nên ta loại 

\(\dfrac{6}{8}=\dfrac{15}{x}\\ \Rightarrow6\times x=15\times8\\ \Rightarrow6\times x=120\\ \Rightarrow x=120:6\\ \Rightarrow x=20\)

Vậy \(x=20\)

Nhanh lên cíu tui v☹i

tớ chọn B

Bài giải:

Đổi: 7km 50m = 7 050m

Vì vậy 7km 50m < 7500m

Đáp án B

3,07 nhé!

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