Question

tính nhanh :

\(4\frac{2}{5}+5\frac{6}{9}+2\frac{3}{4}+\frac{3}{5}+\)\(\frac{1}{3}+\frac{1}{4}\)

 

Answer 1

\(4\frac{2}{5}+5\frac{6}{9}+2\frac{3}{4}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}\)

\(=4+\frac{2}{5}+5+\frac{6}{9}+2+\frac{3}{4}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}\)

\(=4+\frac{2}{5}+5+\frac{2}{3}+2+\frac{3}{4}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}\)

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

\(=1+1+1+11\)

\(=14\)

Answer 2

=22/5+51/9+11/4+3/5+1/3+1/4

=(22/5+3/5)+(11/4+1/4)+(51/9+1/3)

=5+3+6

=14

Answer 3

\(4\frac{2}{5}+5\frac{6}{9}+2\frac{3}{4}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}\)

\(=\left(\frac{22}{5}+\frac{3}{5}\right)+\left(\frac{51}{9}+\frac{1}{3}\right)+\left(\frac{11}{4}+\frac{1}{4}\right)\)

\(=5+6+3\)

\(=14\)

Vậy ...

Answer 4

\(4\frac{2}{5}+5\frac{6}{9}+2\frac{3}{4}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}=4+\frac{2}{5}+5+\frac{6}{9}+2+\frac{3}{4}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}\) 

\(=\left(\frac{2}{5}+\frac{3}{5}\right)+\left(\frac{6}{9}+\frac{1}{3}\right)+\left(\frac{3}{4}+\frac{1}{4}\right)+4+5+2=1+1+1+4+5+2=14\)

Answer 5

\(4\frac{2}{5}\)\(+5\frac{6}{9}+2\frac{3}{4}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}\)

=\(\frac{22}{5}+\frac{51}{9}+\frac{11}{4}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}\)

=\(\left(\frac{22}{5}+\frac{3}{5}\right)+\left(\frac{11}{4}+\frac{1}{4}\right)+\left(\frac{51}{9}+\frac{1}{3}\right)\)

=\(5+3+6\)

=\(14\)

chúc bn hok tốt !

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