Aufgaben zu quadratischen Gleichungen - Matheaufgaben-loesen

18.
a) 2x² + 2x - 14 = 0
b) 3x² +18x - 168 = 0
c) 7x² + 7x - 140 = 0
19.
a) (x - 7)(x - 5) = 0
b) (x + 3)(x - 13) = 0
c) (x - √7)(x - √5) = 0
d) (x - a + b)(x - b + c) = 0
20.
a) (x - 1)² = 1 - x²
b) x² + (a - x)² = (a - 2x)²
c) (x - 6)(x - 5) + (x - 7)(x - 4) = 10
21.
1
a) 2x + --- = 3
x
x 25
b) --- + ----- = 3
4 x
x + 11 2x + 1
c) --------- = ---------
x + 3 x + 5
22.
5x - 1 3x - 1 2
a) -------- + -------- = --- + x - 1
9 5 x
5x - 7 14
b) -------- + --------- = x - 1
9 2x - 3