Question

Efectuati:

a) -1·(+2)+(-3)·(+4)+(-5)·(+6)
b) -5·[-4-3·(-2-1)]
c) 11·(-2)+(-4)·[-100-4·(-26)]
d) 200-7·[(-25+4·7)-3·(11-13)]
e) -2·{-2·[-2·(1753-1748)+1]}

Answer 1

a) -1·(+2)+(-3)·(+4)+(-5)·(+6) = - 2 - 12 - 30 = - 14 - 30 = - 44 

b)  -5·[ - 4 - 3·( - 2 - 1) ] = - 5 · [ - 4 - 3 · (- 3 )] = - 5 · ( - 4 + 9 ) = - 5 · + 5 = - 25 

c) 11·(-2)+(-4)·[-100-4·(-26)] = - 22  + ( - 4 ) · ( - 100 + 104) = - 22 + ( - 4) · 4 =
= - 22 - 16 = - 38 

d)  200 - 7 · [ ( -25 + 4 · 7)  - 3 · ( 11 - 13) ]= 
= 200 - 7 · [ ( - 25 + 28 ) - 3 · ( - 2) ] =
= 200 - 7 · ( 3 + 6 ) =
= 200 - 7 · 9 =
= 200 - 63 =
= 137 

e) - 2· { - 2 · [ - 2· ( 1 753  - 1 748)+1 ] }= 
= - 2 · [ - 2 · ( - 2 ·5  + 1 ) ] =
= - 2 · [ - 2 · ·( - 9 ) ] =
=  - 2 · (+ 18) = 
= - 36