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a)
2x+1
--------------
(x+1)(2x+3)
x+1 = 0 => x = -1
2x+3 = 0 => x = -1,5
D: R \ {-1,5; -1}
b)
4x 4x
------ = -------------
x²-9 (x+3)(x-3)
x+3 = 0 => x = -3
x-3 = 0 => x = 3
D : R \{-3;3}
c)
24 24
------------ = ---------
x²+2x+1 (x+1)²
D : R \ {-1}
d)
x²-1 (x+1)(x-1) (x+1)(x-1) x+1
---------- = --------------- = --------------- = ---------
x²-2x+1 (x-1)² (x-1)(x-1) x-1
D : R \ {1}
e)
x²-y² (x²-y²)(x+2y)(x+2y)
--------- · (x+2y)² = -------------------------- = (x²-y²)(x+2) = x³+2x²-xy²-2y²
x+2y x+2y
Z: x ≠-2y
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a)
2x+1
--------------
(x+1)(2x+3)
x+1 = 0 => x = -1
2x+3 = 0 => x = -1,5
D: R \ {-1,5; -1}
b)
4x 4x
------ = -------------
x²-9 (x+3)(x-3)
x+3 = 0 => x = -3
x-3 = 0 => x = 3
D : R \{-3;3}
c)
24 24
------------ = ---------
x²+2x+1 (x+1)²
x+1 = 0 => x = -1
D : R \ {-1}
d)
x²-1 (x+1)(x-1) (x+1)(x-1) x+1
---------- = --------------- = --------------- = ---------
x²-2x+1 (x-1)² (x-1)(x-1) x-1
D : R \ {1}
e)
x²-y² (x²-y²)(x+2y)(x+2y)
--------- · (x+2y)² = -------------------------- = (x²-y²)(x+2) = x³+2x²-xy²-2y²
x+2y x+2y
Z: x ≠-2y