Question

tinh bang cach thuan tien nhat11+21+19+29

Answer 1

=(11+19)+(21+29)

=30+50

=80

Answer 2

\(\left(11+19\right)+\left(21+29\right)=30+50=80\)

Answer 3

(11+19)+(21+29)=30+50=80

Answer 4

=(11+19)+(21+29)

=30+50

=80

Answer 5

\(11+21+19+29\)

\(=\left(11+29\right)+\left(21+19\right)\)

\(=40+40\)

\(=80\)

Answer 6

11+21+19+29

=(11+29) +(21+19)

=40+40=80

Answer 7

=11+19+21+29

=30+50

=80

Answer 8

11 + 21 + 19 + 29

= ( 11 + 29 ) + ( 21 + 19 )

=  40 + 40

= 40 x 2

= 80

Answer 9

11+21+19+29

=11+19+21+29

=30+50

=80

Answer 10

= 80 nhé

Answer 11

   11 + 21 + 19 + 29

= (11 + 19 ) + ( 21 + 29)

= 30 + 50

= 80

Answer 12

11+21+19+29

=(11+19)+(21+29)

=30+50

=80

k nha

Answer 13

bằng 80 nha bạn ơi

Answer 14

11+21+19+29=(11+19)+(21+29) =30+40=70

Answer 15

Tương tự như bài 1+8+27+32 thôi nhưng trước tiên mình sẽ đảo số

  11+21+19+29

=11+19+21+29

=   30   +   50

=         80

Answer 16

11+21+19+29

=(11+19)+(21+29)

=30+50

=80

Answer 17

\(11+21+19+29\)

\(=\left(11+19\right)+\left(21+29\right)\)

\(=30+50\)

\(=80\)

Học tốt~