Question

Tính nhanh

a) ( 768 - 39 ) -768

b) (-1579 ) - ( 12 - 1579 )

giúp mk

Answer 1

a) \(\left(768-39\right)-768=768-39-768=768-768-39=0-39=-39\)

b)\(\left(-1579\right)-\left(12-1579\right)=\left(-1579\right)-12+1579=\left[\left(-1579\right)+1579\right]-12=0-12=-12\)

Answer 2

a. (768 - 39) - 768

= 768 - 39 - 768

= 768 - 768 - 39

= 0 - 39

= -39

b. (-1579) - (12 - 1579)

= (-1579) - 12 + 1579

= [(-1579) + 1579] - 12

= 0 - 12

= -12

Answer 3

chờ mình xíu

 

Answer 4

câu a là -39 nha bn

 

Answer 5

a, (768 - 39 ) - 768

= 768 - 39 - 768

= 0 - 39

= -39

b, (-1579) - ( 12 - 1579)

= (-1579) - 12 + 1579

= [ ( -1579 ) + 1579 ] - 12

= 0 - 12

= -12