Question

tính bằng cách thuận tiện nhất :

a)(976+865)+135 =

b)(2/5 +7/9)+3/5=

19/11+(8/13+3/11)=

Answer 1

1976

16/9

34/13

Answer 2

1976

16/9

34/13

Answer 3

1976

16/9

34/13

Answer 4

1976

16/9

34/13

Answer 5

a , 976 + 865 + 135 = 976 + ( 865 + 135 ) 

                                = 976 + 1000

                                = 1976 

b , \(\frac{2}{5}+\frac{7}{9}+\frac{3}{5}\)\(=\left(\frac{2}{5}+\frac{3}{5}\right)+\frac{7}{9}\)                                             

                                    \(=1+\frac{7}{9}\)

                                     \(=\frac{16}{9}\)

c , \(\frac{19}{11}+\frac{8}{13}+\frac{3}{11}\)\(=\left(\frac{19}{11}+\frac{3}{11}\right)+\frac{8}{13}\)

                                            \(=2+\frac{8}{13}\)

                                            \(=\frac{34}{13}\)

Thưn thịn thỳ t i c k Khả nha  

Answer 6

Bài làm :

a) ( 976 + 865 ) + 135 

= 976 + 865 + 135 

= ( 865 + 135 ) + 976

= 1000 + 976 

= 1976

b) \(\left(\frac{2}{5}+\frac{7}{9}\right)+\frac{3}{5}\)

= \(\frac{2}{5}+\frac{7}{9}+\frac{3}{5}\)

= \(\frac{7}{9}+\left(\frac{2}{5}+\frac{3}{5}\right)\)

= \(\frac{7}{9}+1\)

= \(\frac{16}{9}\)

c) \(\frac{19}{11}+\left(\frac{8}{13}+\frac{3}{11}\right)\)

= \(\frac{19}{11}+\frac{8}{13}+\frac{3}{11}\)

= \(\left(\frac{19}{11}+\frac{3}{11}\right)+\frac{8}{13}\)

= \(2+\frac{8}{13}\)

= \(\frac{34}{13}\)

T i c k Mun ủng hộ Mun nhé