Question

Tính :                                                                                                                          a, 5 + 2/3                b, 12/5 x 1/4                 c,3/8 - 1/3              d, 6/15 - 1/3 : 5/3         Bạn nào nhanh và đúng nhất mình ticks đúng cho nha!

Answer 1

a) \(5+\dfrac{2}{3}=\dfrac{15}{3}+\dfrac{2}{3}=\dfrac{17}{3}\)

b) \(\dfrac{12}{5}\cdot\dfrac{1}{4}=\dfrac{3}{5}\)

c) \(\dfrac{3}{8}-\dfrac{1}{3}=\dfrac{9}{24}-\dfrac{8}{24}=\dfrac{1}{24}\)

d) \(\dfrac{6}{15}-\dfrac{1}{3}:\dfrac{5}{3}=\dfrac{6}{15}-\dfrac{1}{3}\cdot\dfrac{3}{5}=\dfrac{6}{15}-\dfrac{1}{5}=\dfrac{6}{15}-\dfrac{3}{15}=\dfrac{3}{15}=\dfrac{1}{5}\)

 

Answer 2

\(5+\dfrac{2}{3}=\dfrac{5}{1}+\dfrac{2}{3}=\dfrac{15}{3}+\dfrac{2}{3}=\dfrac{17}{9};\dfrac{12}{5}x\dfrac{1}{4}=\dfrac{12}{40};\dfrac{3}{8}-\dfrac{1}{3}=\dfrac{9}{24}-\dfrac{8}{24}=\dfrac{1}{24}\)

Answer 3

\(\dfrac{6}{15}-\dfrac{1}{3}:\dfrac{5}{3}=\dfrac{6}{15}-\dfrac{3}{15}=\dfrac{3}{15}=\dfrac{1}{3}\)

Answer 4

nếu cs cái nào mk chx mà rút gọn dc bn tự rút gọn nha

Answer 5

Giải:

a) \(5+\dfrac{2}{3}=\dfrac{15}{3}+\dfrac{2}{3}=\dfrac{15+2}{3}=\dfrac{17}{3}\) 

b) \(\dfrac{12}{5}\times\dfrac{1}{4}=\dfrac{12\times1}{5\times4}=\dfrac{12}{20}=\dfrac{3}{5}\) 

c) \(\dfrac{3}{8}-\dfrac{1}{3}=\dfrac{9}{24}-\dfrac{8}{24}=\dfrac{9-8}{24}=\dfrac{1}{24}\) 

d) \(\dfrac{6}{15}-\dfrac{1}{3}:\dfrac{5}{3}=\dfrac{6}{15}-\dfrac{1}{3}\times\dfrac{3}{5}=\dfrac{6}{15}-\dfrac{1}{5}=\dfrac{3}{15}=\dfrac{1}{5}\)