Question

Tính:

D=|-347|+(-40)+3150+(-307)

R =|-129|-119+|2-31|

Q= 100+98+96+...+4+2-97-95-...-3-1

 

Answer 1

D=|-347|+(-40)+3150+(-307)

=347-40+3150-307=3150

R =|-129|-119+|2-31|

=129-119+31-2=39

 

Answer 2

R =|-129|-119+|2-31|

\(=129-119+29\) \(=10+29\)\(=39\)

Answer 3

Q= 100+98+96+...+4+2-97-95-...-3-1

\(=100+\left(98-97\right)+\left(96-95\right)+...+\left(2-1\right)\)\(=100+1.49\)\(=100+49\)\(=149\)