Question

Giúp nốt câu 

-3/7 . 12/25 -3/7 . 13/25 +2 2/7 ( 2 2/7 là hỗn số )

Answer 1

\(-\dfrac{3}{7}\cdot\dfrac{12}{25}-\dfrac{3}{7}\cdot\dfrac{13}{25}+2\dfrac{2}{7}\)

\(=\dfrac{3}{7}\cdot\left(-\dfrac{12}{25}\right)-\dfrac{3}{7}\cdot\dfrac{13}{25}+\dfrac{16}{7}\)

\(=\dfrac{3}{7}\cdot\left(-\dfrac{12}{25}-\dfrac{13}{25}\right)+\dfrac{16}{7}\)

\(=\dfrac{3}{7}\cdot\left(-1\right)+\dfrac{16}{7}\)

\(=-\dfrac{3}{7}+\dfrac{16}{7}\)

\(=\dfrac{13}{7}\)

Answer 2

rồi rốt cuộc ai đúng

Answer 3

` -3/7 . 12/25 - 3/7 . 13/25 + 2(2)/7 = -3/7 ( 12/25 + 13/25 ) + 2(2)/7 = -3/7 . 25/25 + 2(2)/7 = -3/7 . 1 + 2(2)/7 = -3/7 + 16/7 = 13/7 `