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Rezolvati ecuatiile:
1)3-2x=5
2)5x+8=x-3
3)3(2x+1)=2(x+1)
4)2-2(1-x)=4(2x+1)+6
5)(x+3)la patrat+(x-4)la patrat=19+2(x-5)(x+5)


Răspuns :

-2x=2 => x = -1
5x-x=-3-8 => 4x=-11  => x= - 11/4
6x+3=2x+2 => 6x-2x=2-3 => 4x=-1 => x= - 1/4
2-2+2x=8x+4+6 => 2x= 8x +10 => 2x-8x=10 => -6x=10 => x= -3/5

3-2x=5
-2x=5-3
-2x=2
x=-1

5x+8=x-3
5x-x=-3-8
4x=-11
x=-11/4

3(2x+1)=2(x+1)
6x+3=2x+2
6x-2x=2-3
4x=-1
x=-1/4

2-2(1-x)=4(2x+1)+6
1-x=8x+4+6
-x-8x=4+6-1
-7x=9
x=9/-7

(x+3)²=x²+2×x×3+3²

        =x²+6x+9
(x-4)²=x²-2×x×4+4²
       =x²-8x+16
(x-5)(x+5)=x²-5²= x²-25

x²+6x+9+x²-8x+16=19+2×x²-25
x²+6x+x²-8x-2x²=19-25-9-16
-2x=-31
x=31/2