ZAD.1 Ustal dziedzinę wyrażeń i wykonaj działania:
a)
b)
c)
d)
e)
6/x-2 : 3/4x-3 = 6/x-2 * 4x-3/3 = 8x-6 / x-2
x-2=0
x=2
D=R-{2}
b) 8x²+16x-24x-48 / 2x²-6x+4x-12 = 8x²-8x-48 / 2x² - 2x - 12
Δ=b²-4ac
=√100
Δ=10
x1 = 2-10/4= -2
x2 = 2+10/4 = 3
D= R -{-2,3}
c) w dodawaniu najpierw musisz sprowadzić do wspólnego mianownika
2(x+3) + 4(x-3) / (x-3)(x+3) = 2x+6+4x-12 / (x-3)(x+3) = 6x-6 / (x-3)(x+3)
D=R-{-3,3}
d) 2(x+2)+2x(x³+x) / (x³+x)(x+2) = 2x+4+ 2x⁴+2x² / (x³+x)(x+2)
D=R{-2}
e) -4x(x+2) - 2x(x-4) / (x-4)(x+2) = -4x²-8x-2x²+8x / (x-4)(x+2) = 6x² / (x-4)(x+2)
D=R-{-2,4}
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a)
b)
c)
d)
e)
6/x-2 : 3/4x-3 = 6/x-2 * 4x-3/3 = 8x-6 / x-2
x-2=0
x=2
D=R-{2}
b) 8x²+16x-24x-48 / 2x²-6x+4x-12 = 8x²-8x-48 / 2x² - 2x - 12
Δ=b²-4ac
=√100
Δ=10
x1 = 2-10/4= -2
x2 = 2+10/4 = 3
D= R -{-2,3}
c) w dodawaniu najpierw musisz sprowadzić do wspólnego mianownika
2(x+3) + 4(x-3) / (x-3)(x+3) = 2x+6+4x-12 / (x-3)(x+3) = 6x-6 / (x-3)(x+3)
D=R-{-3,3}
d) 2(x+2)+2x(x³+x) / (x³+x)(x+2) = 2x+4+ 2x⁴+2x² / (x³+x)(x+2)
D=R{-2}
e) -4x(x+2) - 2x(x-4) / (x-4)(x+2) = -4x²-8x-2x²+8x / (x-4)(x+2) = 6x² / (x-4)(x+2)
D=R-{-2,4}