Bài tập chuyên đề Toán 6 Dạng 2: Các phép toán về cộng, trừ, nhân , chia phân số có đáp án

b) $\frac{7}{-25}+\frac{-8}{25}$

c) $\frac{6}{13}+\frac{-15}{39}$

d) $\frac{5}{7}+\frac{4}{-14}$

e) $\frac{-8}{18}+\frac{-15}{27}$

b) $\left(-2\right)+\frac{-5}{8}$

c) $\frac{1}{-8}+\frac{-5}{9}$

d) $\frac{6}{13}+\frac{-14}{39}$

e) $\frac{-18}{24}+\frac{15}{21}$

2) $x-\frac{1}{5}=\frac{2}{11}$

3) $x-\frac{5}{6}=\frac{16}{42}+\frac{-8}{56}$

4) $\frac{x}{5}=\frac{5}{6}+\frac{-19}{30}$

5) $\left.x\right|-\frac{1}{4}=\frac{6}{18}$

6) $x=\frac{-1}{2}+\frac{3}{4}$

7) $\frac{x}{15}=\frac{3}{5}+\frac{-2}{3}$

8) $\frac{11}{8}+\frac{13}{6}=\frac{85}{x}$

9) $x-\frac{7}{8}=\frac{13}{12}$

10) $x-\frac{-6}{15}=\frac{4}{27}$

b) $B=\left(\frac{-1}{6}+\frac{5}{12}\right)+\frac{7}{12}$

c) $C=\frac{-5}{7}+\frac{3}{4}+\frac{-1}{5}+\frac{-2}{7}+\frac{1}{4}$

d) $D=\frac{-3}{31}+\frac{-6}{17}+\frac{1}{25}+\frac{-28}{31}+\frac{-11}{17}+\frac{-1}{5}$

$\text{B = }\frac{\text{2}}{\text{15}}+(\frac{5}{9}+\frac{-6}{9})$

$\text{C = (}\frac{\text{-1}}{\text{5}}+\frac{3}{12})+\frac{-3}{4}$