Question

efectuati calculele:a)-17+(-3-5)-(-1+3)-(+2-6) b)[-4-(-3+5)+(-7+9)]-[-4+3-(-4+7)]​

Answer 1

Răspuns:

a) - 17 + ( - 3 - 5 ) - ( - 1 + 3 ) - ( + 2 - 6)

= - 17 + ( - 8 ) - 2 - ( - 4 ) =

= - 17 + 8 - 2 + 4 =

= - 27 + 4 =

= - 23

b) [ - 4 - ( - 3 + 5 ) + ( - 7 + 9 )] - [ - 4 + 3 - ( - 4 + 7)]

= ( - 4 - 2 + 2 ) - ( - 4 + 3 - 3 ) =

= - 4 - ( - 4 ) =

= - 4 + 4 =

= 0