a)
3784 + 23 - 3784 - 15
= ( 3784 - 3784 ) + ( 23 - 15 )
= 0 + 8 = 8
b) 21 + 22 + 23 + 24 - 11 - 12 - 13 - 14
= ( 21 - 11 ) + ( 22 - 12 ) + ( 23 - 13 ) + ( 24 - 14 )
= 10 + 10 + 10 + 10 = 10 x 4 = 40
a) 3784 + 23 - 3785 - 15
= (3784 - 3785) + (23 - 15)
= -1 + 8
= 7
b) 21 + 22 + 23 + 24 - 11 - 12 - 13 - 14
= (21 - 11) + ( 22 - 12) + ( 23 - 13) + ( 24 - 14)
= 10 + 10 + 10 + 10
= 10 x 4
= 40
a, 3784+23-3785-15
= ( 3784-3785 )+( 23-15 )
= -1+8
= 7
b, 21+22+23+24-11-12-13-14
= ( 21-11 )+( 22-12 )+( 23-13 )+( 24-14 )
= 10 + 10 +10 + 10
=10.4
=40
Chúc ban học giỏi
a.3784+23-3785-15
=(3784-3785)+(23-15)
=-1+8
=7
b.21+22+23+24-11-12-13-14
=(21-11)+(22-12)+(23-13)+(24-14)
=10+10+10+10
=10.4
=40
â) 7 b) 40 nhé bạn tk cho mình đi