funkcja wymierna
Filip: Rozłóż funkcję wymierną na ułamki proste:
f(x)= (3−2x) / (x4+2x3+2x2)
2 lut 14:26
mat: x
4+2x
3+2x
2=x
2(x
2+2x+2)=
3−2x | | ax+b | | cx+d | |
| = |
| + |
| |
x2(x2+2x+2) | | x2 | | x2+2x+2 | |
(3−2x)=(ax+b)(x
2+2x+2)+(cx+d)x
2
3−2x=ax
3+2ax
2+2ax+bx
2+2bx+2b+cx
3+dx
2
3−2x=(a+c)x
3+(2a+b+d)x
2+(2a+2b)x+2b
a+c=0
2a+b+d=0
2a+2b=−2
| 5 | |
2a+2b=−2→2a=−2−2b=−2−3=−5→a=− |
| |
| 2 | |
| 3 | | 7 | |
2a+b+d=0→d=−2a−b=5− |
| = |
| |
| 2 | | 2 | |
3−2x | | | | | |
| = |
| + |
| |
x2(x2+2x+2) | | x2 | | x2+2x+2 | |
2 lut 14:39
studentka: 3−2x | | 3−2x | | A | | B | | Cx+D | |
| = |
| = |
| + |
| + |
| |
x4+2x3+2x2 | | x2(x2+2x+2) | | x | | x2 | | x2+2x+2 | |
2 lut 14:40