Question

Tính :  a. 150/120+15/27; 42/49  + 56/84

Answer 1

\(\dfrac{120}{150}+\dfrac{15}{27}=\dfrac{4}{5}+\dfrac{5}{9}=\dfrac{36}{45}+\dfrac{25}{45}=\dfrac{61}{45}\)

b

\(\dfrac{42}{49}+\dfrac{56}{84}=\dfrac{6}{7}+\dfrac{14}{21}=\dfrac{18}{21}+\dfrac{14}{21}=\dfrac{32}{21}\)

Answer 2

150/120 + 15/27
= 5/3 + 5/9
= 20/9

42/49 + 56/84
= 6/7 + 2/3
= 32/21

Answer 3

\(\dfrac{150}{120}+\dfrac{15}{27}=\)

 \(\dfrac{4}{5}+\dfrac{5}{9}=\dfrac{36}{45}+\dfrac{25}{45}=\dfrac{61}{45}\)

b.\(\dfrac{42}{49}+\dfrac{56}{84}\)

= \(\dfrac{18}{21}+\dfrac{14}{21}\)

= \(\dfrac{32}{21}\)