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1 )a,b
3)a,b,c
dau coroana

1 Ab 3abc Dau Coroana class=

Răspuns :

Capsunica35
1)a) 2(x+2)-x-4=
2x+4-x=4
x=4-4
x=0
b)(x+1)²-(x-1)²=0
x²+2x+1-x²+2x-1=0
4x=0
x=0
3)x-y+1=0
x=0
0-y+1=0
-y=-1
y=1
b)y=-1
x-(-1)+1=0
x+2=-1
x=-1-2
x=-3
c)x=a
a-y+1=0
-y=-1-a
y=1+a

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