Răspuns:
Explicație pas cu pas:
2) a)
- ( - 54 + 21 ) + ( - 19 + 21 ) - ( 54 + 17 ) + 2 = - 34
= - ( - 33 ) + ( + 2 ) - 71 + 2 =
= + 33 + 2 - 69 =
= 35 - 69 =
= - 34
____________________________________
c)
[ - 9 + 13 - ( - 9 + 13 - 10 ) ] - ( - 7 + 17 ) = 0
= [ 4 - ( 4 - 10 ) ] - ( + 10 ) =
= [ 4 - ( - 6 ) ] - 10 =
= ( 4 + 6 ) - 10 =
= 10 - 10 =
= 0
____________________________________
d)
( - 11 + 37 - 42 ) + ( - 37 + 45 + 11 ) - 5 = - 2
= ( + 26 - 42 ) + ( 8 + 11 ) - 5 =
= - 16 + 19 - 5 =
= 3 - 5 =
= - 2
_______________________________________________________
5) a)
( - 4) × ( - 2 ) × ( - 10 ) : [ 120 : ( - 3) ] = 2
= - 80 : ( - 40 ) =
= + 2
_____________________________________
b)
[ - 9 × 4 × ( - 6) ] : [ ( - 1 ) × ( - 3 ) ] = 72
=[ - 36 × ( - 6) ] : ( + 3 ) =
= ( + 216) : 3 =
= 72
_________________________________
c)
[ ( - 6) × 27 : ( - 9 ) ] : ( - 18 ) × 9 = - 9
= ( 6 × 3 ) : ( - 18 ) × 9 =
= 18 : ( - 18 ) × 9 =
= - 1 × 9 =
= - 9
_____________________________
d)
[ ( - 6 ) × ( - 11 ) × ( - 1 ) ] : [ ( - 121 ) : 11 × 3 ] = 2
= ( - 66 ) : ( - 11 × 3 ) =
= ( - 66 ) : ( - 33 ) =
= 2
