Câu hỏi của Nguyễn Thị Ngọc Diệu

Question

tính nhanh

a, 1/2+1/4+1/2+3/4+5/5

b,2/5:4/3x5/6:3/4

Nguyễn Lê Phước Thịnh · Accepted Answer

a: $\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{2}+\dfrac{3}{4}+\dfrac{5}{5}$

$=\left(\dfrac{1}{2}+\dfrac{1}{2}\right)+\left(\dfrac{1}{4}+\dfrac{3}{4}\right)+\dfrac{5}{5}$

$=1+1+1=3$

b: $\dfrac{2}{5}:\dfrac{4}{3}\times\dfrac{5}{6}:\dfrac{3}{4}$

$=\dfrac{2}{5}\times\dfrac{3}{4}\times\dfrac{5}{6}\times\dfrac{4}{3}$

$=\dfrac{2}{5}\times\dfrac{5}{6}=\dfrac{2}{6}=\dfrac{1}{3}$

Câu trả lời:

a: $\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{2}+\dfrac{3}{4}+\dfrac{5}{5}$

$=\left(\dfrac{1}{2}+\dfrac{1}{2}\right)+\left(\dfrac{1}{4}+\dfrac{3}{4}\right)+\dfrac{5}{5}$

$=1+1+1=3$

b: $\dfrac{2}{5}:\dfrac{4}{3}\times\dfrac{5}{6}:\dfrac{3}{4}$

$=\dfrac{2}{5}\times\dfrac{3}{4}\times\dfrac{5}{6}\times\dfrac{4}{3}$

$=\dfrac{2}{5}\times\dfrac{5}{6}=\dfrac{2}{6}=\dfrac{1}{3}$