Wykonaj dzielenie. odpowiedź podaj w najprostszej postaci.
lolka: Wykonaj dzielenie. odpowiedź podaj w najprostszej postaci.
a) [(x2−6x) / (x+3)] / x / (x+2)
b) [x / (6−x)] / [(x2+x) / (x2−36)]
c) [(x2−1) / (x2+x)] / [(x2−2x+1) / (x2+1)
19 lis 20:28
19 lis 20:29
cos:
28 maj 08:28
Li Muqin:
c)
Założenie
x
2+x=x(x+1)≠0 to x≠0 lub x≠−1
x
2+1≠0 to x∊R
x
2−2x+1=(x−1)
2≠0 to x≠1
x2−1 | | x2−2x+1 | |
| : |
| = |
x2+x | | x2+1 | |
| (x−1)(x+1) | | x2+1 | |
= |
| * |
| = |
| x(x+1) | | (x−1)2 | |
| 1 | | x2+1 | | x2+1 | |
= |
| * |
| = |
| |
| x | | x−1 | | x2−x | |
28 maj 13:35
Li Muqin:
b)
Zalozenie
6−x≠0 x≠6
x
2−36≠0 to x≠6 lub x≠−6
x
2+x≠0 to x≠0 lub x≠−1
| x | | (x+6)(x−6) | |
= |
| * |
| = |
| 6−x | | x(x+1) | |
| 1 | | (x+6)(x−6) | |
= |
| * |
| = |
| 6−x | | x+1 | |
| 1 | | (x+6)(x−6) | |
= |
| * |
| = |
| −(x+6) | | x+1 | |
28 maj 13:46