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2x-6/x ÷ x-3/4x²
25-x²/x²+2x+1 ÷ x-5/x+1
2x-6/x ÷ x-3/4x² zał x≠0
2x-6 4x² 2(x-3) 4x²
------ * ------- = ------- * ------- = skracam na krzyż i otrzymuje :
x x-3 x x-3
= 2 * 4x = 8x
25-x² x-5 zał : x≠{-1}
-------- ÷ ------- =
x²+2x+1 x+1
(5-x)(5+x) x+1 (5-x)(5+x) x+1
=-------- --* -------=--------- * -------- = skracam na krzyż i otrzymuje
(x+1)² x-5 (x+1)² -(5-x)
5+x 1 5+x -(-5-x) -5-x
=-------* ------ = ----------=-----------= --------
x+1 -1 -(x+1) -(x+1) x+1
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2x-6/x ÷ x-3/4x² zał x≠0
2x-6 4x² 2(x-3) 4x²
------ * ------- = ------- * ------- = skracam na krzyż i otrzymuje :
x x-3 x x-3
= 2 * 4x = 8x
25-x² x-5 zał : x≠{-1}
-------- ÷ ------- =
x²+2x+1 x+1
(5-x)(5+x) x+1 (5-x)(5+x) x+1
=-------- --* -------=--------- * -------- = skracam na krzyż i otrzymuje
(x+1)² x-5 (x+1)² -(5-x)
5+x 1 5+x -(-5-x) -5-x
=-------* ------ = ----------=-----------= --------
x+1 -1 -(x+1) -(x+1) x+1