Question

Se considera numerele a= -3 , b= +5, c= 7 . Sa se calculeze :
a) a-b+c =
b)(a-b) + (b+c ) =
c) a ori c + b ori c=
d) 3a la a 2 - 2bc -c la a doua =

Answer 1

a) -3-(+5)+7=-3-5+7=-8+7= -1
b) ( -3 -5)+(5+7)= -8 +12= +4
c) ( -3)x7+5x7= -21+35=+14
d) 3x(-3)² - 2x5x7 - 7²= 3x9-70-49=27-70-49= -43-49= - 92