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a fost răspuns

Efectuați:
a) 7x-[5y-(3x-2y-5)]+7-10x-9y=
b) 13y+{-4x-[5xy+2y-(7x-13+10y)]}=
c) 23-[17-(3x+a)]+[(4x+5)-(3x-2a)+9=

Răspuns :

7x-[5y-(3x-2y-5)]+7-10x+9y= 7x-(5y-3x-2y-5)+7-10x+9y= 7x-3y-3x-5+7-10x+9y=-6x+12y+2