Question

[Ngọt ngào và cay đắng]

a.13.(23+22)-3.(17+28)

b.-48+48.(-78)+48(-21)

c.135.(171-123)-171.(135-123)

d.1-2+3-4+..........+99-100

e.2-4+6-8+..........+48-50

j.-1+3-5+7-........-97+98-99-100

Answer 1

[Trang Thùy]

a) 13.(23+22)-3.(17+28)

= 13.45 - 3.45

= 45(13-3)

= 45.10 =450

b) -48+48.(-78)+48(-21)

= -48 + 48(-78 - 21)

= -48 + 48.(-99)

= -48 + ( -4752)

= -4800

c) 135.(171-123)-171.(135-123)

= 135.171 - 135.123 - 171.135 + 171.123

= (135.171 - 171.135) - (135.123 - 171.123)

= - 123(135 - 171) = (-123).(-36)= 4428

Answer 2

[chu do minh tuan]

https://i.imgur.com/5WebIrN.png