Question

[Nguyễn Đăng Nhân]

Tính nhanh

a. (72 - 8 x9) : (20 + 21 + 22 + 23 + 24 + 25)

b. (500 x 9 - 250 x 18 ) x (1 + 2 + 3 + ...+ 9)

c. (11 + 13 + 15 + ...+ 19) x (6 x 8 - 48)

Trả lời từng bước cho mình nhé(ai đúng mình tick.)

Answer 1

[ɣ/ղ✿ʑคภg✿♄ồ‿]

a) ( 72 - 8 x 9 ) : ( 20 + 21 + 22 + 23 + 24 + 25 )

= ( 72 - 72 ) : ( 20 + 21 + 22 + 23 + 24 + 25 )

= 0 : ( 20 + 21 + 22 + 23 + 24 + 25 )

= 0

b) ( 500 x 9 - 250 x 18 ) x ( 1 + 2 + 3 + ... + 9 )

= ( 500 x 9 - 250 x 2 x 9 ) x ( 1 + 2 + 3 + ... + 9 )

= ( 500 x 9 - 500 x 9 ) x ( 1 + 2 + 3 + ... + 9 )

= 0 x ( 1 + 2 + 3 + ... + 9 )

= 0

Answer 2

[wowowow]

a)=(72-72):(20+.....+25)

=0:(20+.......+25)

=0

b)=(4500-4500)*(1+........+9)

=0*(1+........+9)

=0

c)=(11+.............+19)*(48-48)

=(11+...........+19)*0

=0