1. uprosc wyrazenie a-(-(a-1)) 2.zapisz w najprostszej postaci 5y-3(y-1)=? -3(x-7)-(x+2) -(x+2)-3(2x-4)+2(x-1) 3. 4(2x-3y)-2(5x+?)=-2x+2y -(3y-2x)+4(?-y)=-10x? blagam na teraz,

1 a-(-(a-1))=a-(-a+1)=(a+a-1=2a-1 2. 5y-3(y-1)=5y-3y+3=2y+3 -3(x-7)-(x+2)=-3x+21-x-2=-4x+19 -(x+2)-3(2x-4)+2(x-1)=-x-2-6x+12+2x-2=-5x+8   3. 4(2x-3y)-2(5x+?)=-2x+2y -(3y-2x)+4(?-y)=-10x?          brak polecenia i co znaczą te ?

Zadanie 1   a-(-(a-1)) = a-(-a+1)=a+a-1=2a-1   Zadanie 2   5y-3(y-1)=5y-3y+3 = 2y+3 -3(x-7)-(x+2) = -3x+21-x-2 = -4x+19 -(x+2)-3(2x-4)+2(x-1) =  -x-2-6x+12+2x-2 = -5x+8   Zadanie 3   4(2x-3y)-2(5x+?)=-2x+2y 8x-12y-2(5x+?)=-2x+2y 10x-14y=10x+2? ?=-7y   -(3y-2x)+4(?-y)=-10x? -3y+2x=-10x?+4(?-y)   4(?-y) = -3y  4?-4y=-3y 4?=y     ? = -5 ? =  y/4