Question

Câu 1: Tính:

a) 100 + (+530) + 2145 + (-630)

b) 15.(-12)

c) (+14).13 + 13.(-24)

d) {[14 : (-2)] + 7} : 2018

Answer 1

a) 100+530+2145+(-630)

=100+(530-630)+2145

=100-100+2145

=2145

b)15.(-12)=-180

Answer 2

c) 14.13+13.(-24)

=13.(14-24)

=13.(-10)

=-130

d){[14:(-2)]+7}:2018

=[(-7)+7]:2018

=0:2018

=0

Answer 3

a) 100 + (+530) + 2145 + (-630)

=100+530+2145-630

=630+2145-630

=(630-630)+2145

=0+2145

=2145

b) 15.(-12)=-180

c) (+14).13 + 13.(-24)

=13.[14+(-24)]

=13.[-10]

=-130

d) {[14 : (-2)] + 7} : 2018

={-7+7}:2018

=0:2018

=2018

Answer 4

a, 100 + 530 + 2145 + ( - 630 ) 

= 630 + 2145 + ( - 630 ) 

= 2145

b,    15.( - 12 ) = - 180 

c, 14. 13 + 13 . ( - 24 )

= 13 . [ 14 + ( - 24 ) ] 

= 13 . ( - 10 ) 

= - 130 

d, {[ 14 : ( -2 )] + 7 } : 2018 

= { [ - 7 ] + 7 } : 2018 

= 0 : 2018 = 0