Question

tính nhanh:

\(\frac{4}{5}\)X \(0,5\)\(+\frac{12}{5}\)X \(0,3+8:10\)X \(0,2\)

 

Answer 1

4/5 x 0,5 + 12/5 x 0,3 + 8 : 10 x 0,2

=4/5 x 0,5 + 12/5 x 0,3 + 4/5 x 0,2

=(4/5 + 12/5 + 4/5) x (0,5 + 0.3 + 0,2)

=4 x 1

=4

Answer 2

\(\frac{4}{5}x0,5+\frac{12}{5}x0,3+8:10x0,2=\)\(\frac{4}{5}x0,5+\frac{12}{5}x0,3+\frac{8}{10}x0,2=\)\(\frac{4}{5}x0,5+\frac{12}{5}x0,3+\frac{4}{5}x0,2=\)

\(=\frac{4}{5}x\left(0,5+0,2\right)+\frac{12}{5}x0,3\)\(=\frac{4}{5}x\frac{7}{10}+\frac{12}{5}x0,3=\frac{32}{25}\)

Answer 3

\(\frac{4}{5}\)x 0,5+ \(\frac{12}{5}\)x 0,3+ 8: 10x 0,2.

= 0,8x 0,5+ 2,4x 0.3+ 0,8x 0,2.

= 0,4+ 0,72+ 0,16.

= 1,12+ 0,16.

= 1,28.

Answer 4

\(\frac{4}{5}\)x 0,5 + \(\frac{12}{5}\)x 0,3 + 8 : 10 x 0,2

=\(\frac{4}{5}\)x \(\frac{1}{2}\)+ \(\frac{12}{5}\)x \(\frac{3}{10}\)+ \(\frac{8}{1}:\frac{10}{1}\)x \(\frac{1}{5}\)

= \(\frac{2}{5}+\frac{18}{25}:\frac{4}{5}\)x \(\frac{1}{5}\)

= \(\frac{2}{5}+\frac{9}{10}\)x \(\frac{1}{5}\)

= \(\frac{2}{5}+\frac{9}{50}\)

= \(\frac{20}{50}+\frac{9}{50}\)

= \(\frac{29}{50}\)