Question

a, So sánh 3\(\dfrac{2}{5}\) và 3\(\dfrac{4}{10}\)

A. 3\(\dfrac{2}{5}\) < 3\(\dfrac{4}{10}\)       B. 3\(\dfrac{2}{5}\) > 3\(\dfrac{4}{10}\)      C.3\(\dfrac{2}{5}\) = 3\(\dfrac{4}{10}\) 

b,5 \(\dfrac{3}{4}\) = ?

A. \(\dfrac{15}{4}\)               B. \(\dfrac{20}{4}\)              C. \(\dfrac{23}{4}\)

Answer 1

a) Do  \(\dfrac{2}{5}=\dfrac{4}{10}\)

\(\Rightarrow3\dfrac{2}{5}=3\dfrac{4}{10}\)

Chọn C

b) \(5\dfrac{3}{4}=\dfrac{5\times4+3}{4}=\dfrac{23}{4}\)

Chọn C

Answer 2

a: Chọn C

b: Chọn C

Answer 3

\(=>C\)

\(3\dfrac{2}{5}=3\dfrac{4}{10}=>\dfrac{4}{10}=\dfrac{4}{10}\)

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\(=>5\dfrac{3}{4}=\dfrac{23}{4}mà\dfrac{23}{4}=\dfrac{23}{4}nên.5\dfrac{3}{4}=\dfrac{23}{4}\)

Answer 4

a. C

b. C