Wykonaj dodawanie i odejmowanie /odpowiedzi podaj w najprostrzej postaci
a)
b)
c)
Bardzo proszę o pomoc
a) zał. x≠3
2-4 -2
-------=---------
x-3 x-3
b) zał. x≠0; x≠2
(x-5)(x-2) - x² x²-2x-5x+10-x² -7x+10
= ------------------- = --------------------=----------------
x(x-2) x(x-2) x(x-2)
c) zał. x≠0; x≠2
(3x-1)(2x-4)-x(x-5) 6x²-12x-2x+4-x²+5x 5x²-9x+4 5(x-1)(x-0,8)
=--------------------------= ---------------------------------=-----------------=-------------------
x(2x-4) x(2x-4) x(2x-4) 2x(x-2)
d) zał. x≠√3 ; x≠-√3; x≠3
(x-6)(x-3)-(x-2)(x²-3) x²-3x-6x+18-x³+3x+2x²-6
=-------------------------------=----------------------------------------------=
(x²-3)(x-3) (x²-3)(x-3)
-x³+3x²-6x+12
=-----------------------
(x²-3)(x-3)
a) = -2 /(x-3)
b) = [(x-5)(x-2)- x^2]/[x(x-2)]=
= [x^2 - 2x -5x+10- x^2]/ x^2 -2x = (-7x+10)/x^2 -2x
c) = [(3x-1)(2x-4) - x(x-5)] / x(2x-4)=
= [6x^2 -12x -2x +4 -x^2 +5x] / 2x^2 - 4x=
= [5x^2 -9x +4 ]/ 2x^2 -4x
c) = [(x-6)(x-3) -(x^2 -3)(x-2)] /[( x-3)(x^2-3)] =
= [x^2 - 3x -6x +18 -(x^3 -2x^2 - 3x +6)] / [x^3 -3x - 3x^2 +9] =
= -x^3 + 3x^2 +6x +12 / [x^3 -3x^2-3x +9]
Należy określić jeszcze dziedzinę
a) x ≠ 3
b) x ≠0 i x≠2
c) x≠0 i x ≠2
d) x≠3 i x ≠√3 i x≠ -√3
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a) zał. x≠3
2-4 -2
-------=---------
x-3 x-3
b) zał. x≠0; x≠2
(x-5)(x-2) - x² x²-2x-5x+10-x² -7x+10
= ------------------- = --------------------=----------------
x(x-2) x(x-2) x(x-2)
c) zał. x≠0; x≠2
(3x-1)(2x-4)-x(x-5) 6x²-12x-2x+4-x²+5x 5x²-9x+4 5(x-1)(x-0,8)
=--------------------------= ---------------------------------=-----------------=-------------------
x(2x-4) x(2x-4) x(2x-4) 2x(x-2)
d) zał. x≠√3 ; x≠-√3; x≠3
(x-6)(x-3)-(x-2)(x²-3) x²-3x-6x+18-x³+3x+2x²-6
=-------------------------------=----------------------------------------------=
(x²-3)(x-3) (x²-3)(x-3)
-x³+3x²-6x+12
=-----------------------
(x²-3)(x-3)
a) = -2 /(x-3)
b) = [(x-5)(x-2)- x^2]/[x(x-2)]=
= [x^2 - 2x -5x+10- x^2]/ x^2 -2x = (-7x+10)/x^2 -2x
c) = [(3x-1)(2x-4) - x(x-5)] / x(2x-4)=
= [6x^2 -12x -2x +4 -x^2 +5x] / 2x^2 - 4x=
= [5x^2 -9x +4 ]/ 2x^2 -4x
c) = [(x-6)(x-3) -(x^2 -3)(x-2)] /[( x-3)(x^2-3)] =
= [x^2 - 3x -6x +18 -(x^3 -2x^2 - 3x +6)] / [x^3 -3x - 3x^2 +9] =
= -x^3 + 3x^2 +6x +12 / [x^3 -3x^2-3x +9]
Należy określić jeszcze dziedzinę
a) x ≠ 3
b) x ≠0 i x≠2
c) x≠0 i x ≠2
d) x≠3 i x ≠√3 i x≠ -√3