\(-\dfrac{3}{7}.0,4+\left(-\dfrac{3}{7}\right).0,6\)

\(=-\dfrac{3}{7}.\left(0,4+0,6\right)\)

\(=-\dfrac{3}{7}.1=-\dfrac{3}{7}\)

Số nào nhân chia với 1 thì cũng bằng chính nó.

Số nào nhân với 0 thì cũng bằng 0.

Không co phép chia cho 0.

15. Mary said to her friend that she could expect to see her the following Wednesday.

16. He said he didn't know what had happened.

17. She said she had gone to the doctor the day before.

\(\dfrac{3}{4}.x+125\)%\(=-4\)

\(\Rightarrow\dfrac{3}{4}.x+\dfrac{125}{100}=-4\)

\(\Rightarrow\dfrac{3}{4}.x+\dfrac{5}{4}=-4\)

\(\Rightarrow\dfrac{3}{4}.x=\left(-4\right)-\dfrac{5}{4}\)

\(\Rightarrow\dfrac{3}{4}.x=-\dfrac{21}{4}\)

\(\Rightarrow x=-\dfrac{21}{4}:\dfrac{3}{4}\)

\(\Rightarrow x=-\dfrac{21}{4}.\dfrac{4}{3}\)

\(\Rightarrow x=-7\)

Vậy \(x\) = -7

Bạn làm đúng rồi 

Ký tự tiếp theo trong dãy sau đây là ký tự nào: A , C , F , J , O , U

1 = 2

2 = 10

3 = 30

4 = 68

5 = 130