Question

1 + 1 + 1 +1 + 9 + 9 + 9 + 9 = ?

tinh bang cach thuan tien nhat

Answer 1

1+1+1+1+9+9+9+9

= (1+9)+(1+9)+(1+9)+(1+9)

= 10+10+10+10

=40

Answer 2

1+1+1+1+9+9+9+9=40

40 nha bạn

Nhớ k cho mình nha

Answer 3

1 + 1 + 1 + 1 + 9 + 9 + 9 + 9 

=> 1 x 4 + 9 x 4 

=> 4 + 36

=> 40

Answer 4

1 + 1 + 1 + 1 + 9 + 9 + 9 + 9 

=> 1 x 4 + 9 x 4 

=> 4 + 36

=> 40