Question

cộng phân số:

\(\frac{6}{18}+\frac{-14}{21}\)

Answer 1

\(\frac{6}{8}+\frac{-14}{21}=\frac{1}{12}\)

Answer 2

\(\frac{6}{18}+\frac{-14}{21}=\frac{42}{126}+\frac{-84}{126}=\frac{-42}{126}=\frac{-1}{3}\)

Answer 3

+Rút gọn:\(\frac{6}{18}=\frac{6:6}{18:6}=\frac{1}{3};\frac{-14}{21}=\frac{-14:7}{21:7}=\frac{-2}{3}\)

Ta có \(\frac{1}{3}+\frac{-2}{3}=\frac{1+\left(-2\right)}{3}=\frac{-1}{3}\)

Vậy \(\frac{6}{18}+\frac{-14}{21}=\frac{-1}{3}\)

Answer 4

tick mik nha