Question

Tính nhanh

 4 1/10 + 4 2/10 + 4 3/10 + 4 4/10

 

đây là hỗn số nhé

giúp mình nhé, mình cần gấp

 

Answer 1

\(4\frac{1}{10}+4\frac{2}{10}+4\frac{3}{10}+4\frac{4}{10}\)

= \((4+4+4+4)+(\frac{1}{10}+\frac{2}{10}+\frac{3}{10}+\frac{4}{10})\)

= \(4\times4+\frac{1}{10}(1+2+3+4)\)

= \(16+\frac{1}{10}.10\)

= \(16+1=17\)

Answer 2

\(4\frac{1}{10}+4\frac{2}{10}+4\frac{3}{10}+4\frac{4}{10}\)

\(=4+\frac{1}{10}+4+\frac{2}{10}+4+\frac{3}{10}+4+\frac{4}{10}\)

\(=\left(4+4+4+4\right)+\left(\frac{1}{10}+\frac{2}{10}+\frac{3}{10}+\frac{4}{10}\right)\)

\(=16+\frac{10}{10}=16+1=17\)