Question

Answer 1

Câu1

a)<         b)<                  c)>

Answer 2

câu 2 :C

3.A

4.D

Answer 3

câu 1)

a)\(\dfrac{3}{7}< \dfrac{5}{7}\)

b)\(1>\dfrac{14}{15}\)

c)\(\dfrac{8}{9}>\dfrac{12}{18}\)

câu 2) B

câu 3) D

câu 4) D

câu 5)

a) \(\dfrac{3}{4}+\dfrac{5}{4}=\dfrac{3+5}{4}=\dfrac{8}{4}=2\)

b) \(\dfrac{2}{3}+\dfrac{3}{4}=\dfrac{8}{12}+\dfrac{9}{12}=\dfrac{8+9}{12}=\dfrac{17}{12}\)

c) \(\dfrac{1}{3}+\dfrac{5}{7}=\dfrac{7}{21}+\dfrac{15}{21}=\dfrac{7+15}{21}=\dfrac{22}{21}\)

câu 6)

a) \(\dfrac{7}{8}-\dfrac{6}{8}=\dfrac{7-6}{8}=\dfrac{1}{8}\)