2575 + 37 – 2576 – 29 = (2575 – 2576) + (37 – 29) = -1 + 8 = 7

− 1 2 + − 1 9 + − 7 18 + 4 35 + 3 5 + 2 7 = 0

     3784 + 23 - 3785 - 15

= ( 3784 + 1 ) + ( 23 - 1 ) - 3785 - 15

= 3785 + 22 - 3785 - 15

= ( 3785 + 22 ) - 3785 - 15

=  (3785- 3785 ) + 22 - 15

= 0 + 22 - 15

= 22 - 15

= 7

=3784-(3784+1)+23-15

=3784-3784-1+23-15

=-1+23-15

=22-15

=7

cho mh nhé

34 + 35 + 36 + 37 – 14 – 15 – 16 – 17

= (34 – 14) + (35 – 15) + (36 – 16 ) + (37 -17)

= 20 + 20 + 20 + 20 = 80

371+731-271-531=(371-271)+(731-531)=100+200=300

tích mình nhé bạn !!!!!!!

a)  1 3 + − 1 3 + 1 3 = 1 3

b)  − 1 3 + 2 5 + − 2 3 + 4 5 = 1 5

a)  1 3 + − 2 6 + 3 9 = 1 3 + − 1 3 + 1 3 = 1 3

b)  − 4 12 + 18 45 + − 6 9 + 24 30 = − 1 3 + 2 5 + − 2 3 + 4 5 = − 1 + 6 5 = 1 5

3784 + 23 - 3785 -15

= (3785-3784)+(23-15)

=1+8=9

tick đúng mình nhaaaaa

sai rồi hùng oi dap an bang 7 ma