Question

Calculați A)-11+(-120)

Answer 1

Answer:  A) -131

B) 1

C) 442

D) -42

-213

Step-by-step 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