Question

tíh

c \(\frac{4}{9}-\frac{-5}{6}\)

b \(\frac{3}{5}+\frac{4}{-7}\)

a \(\frac{8}{40}-\frac{-36}{45}\)

Answer 1

Tính:

b $\frac{3}{5}+\frac{4}{-7}$

Answer 2

tính

b) \(\frac{3}{5}+\frac{4}{-7}=\frac{3}{5}-\frac{4}{7}=\frac{21}{35}-\frac{20}{35}=\frac{1}{35}\)

a) \(\frac{8}{40}-\frac{-36}{45}=\frac{8}{40}+\frac{36}{45}=\frac{1}{5}+\frac{4}{5}=\frac{5}{5}=1\)

Answer 3

_{2 bài kia bị lỗi, nên mình đăng lại nha! :)}