Question

Tính tổng

e) 371 + 731 – 271 – 531 =

f) 57 + 58 + 59 + 60 + 61 – 17 – 18 – 19 – 20 – 21 =

g) 9 – 10 + 11 – 12 +13 – 14 + 15 – 16 =

Answer 1

=300

=200

=-4 

Ra đề sáng tạo đó

Answer 2

e)371+731-271-531

=(371-271)+(731-531)

=100+200

=300

Answer 3

e) = (371-271)+(731-531)

= 100 + 200 = 300

f) (57 - 17)+(58-18)+(59-19)+(60-20)+(61-21)

= 40+40+40+40+40 = 200

g) (9-10)+(11-12)+(13-14)+(15-16)

= -1+(-1)+(-1)+(-1)

= -4

Answer 4

f) (57 - 17)+(58-18)+(59-19)+(60-20)+(61-21)

= 40+40+40+40+40

=200

Answer 5

g) (9-10)+(11-12)+(13-14)+(15-16)

= -1+(-1)+(-1)+(-1)

= -4