Question

tính bằng cách thuận tiện 

4/15 + 8/13 + 11/5 + 5/13

 

2,07 + 4,15 + 17,93 + 5,85

Answer 1

\(\frac{4}{15}+\frac{8}{13}+\frac{11}{5}+\frac{5}{13}\)

\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)

\(=1+1\)

\(=2\)

2,07 + 4,15 + 17,93 + 5,85

= (2,07 + 17,93) + (4,15 + 5,85)

=    20 + 10

= 30

Answer 2

4/15 + 8/13 + 11/5 + 5/13

= 4/15 + 11/15 + 8/13 + 5/13

= 15/15 + 13/13

= 1 + 1 

= 2

2,07 + 4,15 + 17,93 + 5,85

= ( 4,15 + 5,85 ) + ( 2,07 + 17,93 )

= 10 + 20

= 30

Answer 3

\(\frac{4}{15}+\frac{8}{13}+\frac{11}{15}+\frac{5}{13}\)

\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)

\(=1+1\)

\(=2\)

2,07 + 4,15 + 17,93 + 5,85

= ( 2,07 + 17,93 ) + ( 4,15 + 5,85 )

= 20 + 10

= 30

Answer 4

ở trên là 11/5 mà