Question

3.tính nhanh

a)(1456+323)-1456

b)(-1999)-(-234-1999)

c)(116+124)+(215-116-124)

d)(435-167-89)-(435-89)

Answer 1

a ) ( 1456 + 323 ) - 1456

= 1456 + 323 - 1456

= ( 1456 - 1456 ) + 323 = 323

b ) ( - 1999 ) - ( - 234 - 1999)

= - 1999 + 234 + 1999

= ( - 1999 + 1999 ) + 234 = 0 + 234 = 234

Answer 2

giúp mk với

Answer 3

a ) ( 1456 + 323 ) - 1456

= 1456 + 323 - 1456

= ( 1456 - 1456 ) + 323 = 323

b ) ( - 1999 ) - ( - 234 - 1999)

= - 1999 + 234 + 1999

= ( - 1999 + 1999 ) + 234 = 0 + 234 = 234

P/s tham khảo nha