a) x-2 x-3
___ = _____
x+1 x+2
(x-2)(x+2)=(x+1)(x-3)
x²-2²=x²-3x+x-3
x²+4=x²-3x+x-3
x²-x²+3x+x=-3-4
4x=-7| : 4
x=1,75
b) 2x-3 4x
____ = ___
x+3 2x+3
(2x-3)(2x+3)=(x+3)4x
(2x)²-3²=4x²+12x
4x²+9=4x²+12x
4x²-4x²-12x=-9
-12x=-9|:(-12)
x=0,75
c) 2x-5 2(x-2)
_____ = ______
2x +3 2x+5
(2x-5)(2x+5)=(2x +3)2(x-2)
(2x)²-5²=(2x +3)2x-4
4x²+25=4x²+6x-4
4x²-4x²-6x=-4-25
-6x=-29|:(-6)
x≈4,9
