1.Oblicz .
a. (x + 1)(x -1) -3x = x² + 2
b. (3 - x )(x - 1) = 7 - x (x + 2)
c. x² - (x - 2)(x - 2) = 16
d. (3x - 3)(x - 1) - 3x(x - 5) = 21
e.x - 3 na dole 2(ułamek) + x + 4 na dole 5 (ułamek) = 2x - 2
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a) x²-1-3x=x²+2
-3x=3/(-3)
x=-1
b) 3x-3-x²+1=7-x²-2x
3x-3+1=7-2x
5x=9/5
x=9/5
c)x²-x²+2x+2x+4=16
4x=12/4
x=3
d)3x²-3x-3x+3-3x²+15x=21
9x=18/9
x=2
e)pomnóż wszystko razy 10
5x-15+2x+8=20x-20
-13x=-13 /(-13)
x=1