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5 votes
Calculați A)-11+(-120)

B)18+(-17)

C)+13(+34)

D)-15+(-27)

E) +56+(+27)

F)-32+(-181)

1 Answer

2 votes

Answer: A) -131

B) 1

C) 442

D) -42

-213

Explanation:

Properties we use to solve problems related ti INTEGERS:

For sum :

a +(-b)=a-b

-a-b=-(a+b)

For product :

(+)(+)= (+)

(+)(-)=(-)

(-)(-)=(+)

A) -11+(-120) = -11 -120 [∵ a +(-b)=a-b]

= -(11+120) [∵ -a -b=-(a+b)]

= -131

B) 18+(-17) = 18-17 =1 [∵ a +(-b)=a-b]

C)+13(+34) = +442 [(+)(+)= +]

D) -15+(-27) = -15-27 [∵ a +(-b)=a-b]

= -(15+27) [∵ -a -b=-(a+b)]

= -42

E) +56+(+27) = 56+27=83

F)-32+(-181) = -32-181 [∵ a +(-b)=a-b]

= -(213) [∵ -a -b=-(a+b)]

= -213

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