(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
(0 )2 1436587@9BAC9EDGF4HI 7P5QHRFTSVU0DXW6F4H
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2 x − x +<br />
¢¢¡ ¢ 2<br />
<br />
<br />
<br />
S<br />
¤ 2 ¡ ¢ S ¤ <br />
<br />
x −x+2<br />
α β γ<br />
x2 − x = α (x2 + 1) + β (x + 1) + γ (2x2 − x + 1)<br />
α β γ ¢ <br />
<br />
α + 2γ = 1<br />
β − γ = −1<br />
α + β + γ = 0<br />
= (α + 2γ) x 2 + (β − γ) x + α + β + γ<br />
⇐⇒<br />
α = 1 − 2γ<br />
β = −1 + γ<br />
0 = 2<br />
<br />
=⇒ <br />
2 x − x + 2 ¡ ¢ S <br />
<br />
x 2 − x = (1 − 2γ) x 2 + 1 + (γ − 1) (x + 1) + γ 2x 2 − x + 1 <br />
γ<br />
¡ <br />
<br />
¤ 2 3x − 5x +<br />
¡ ¢ k ¤ <br />
α S<br />
β γ<br />
3x 2 − 5x + k = α (x 2 + 1) + β (x + 1) + γ (2x 2 − x + 1)<br />
α β γ ¢ <br />
<br />
α + 2γ = 3<br />
β − γ = −5<br />
α + β + γ = k<br />
= (α + 2γ) x 2 + (β − γ) x + α + β + γ<br />
⇐⇒<br />
α = 3 − 2γ<br />
β = −5 + γ<br />
−2 = k<br />
<br />
=⇒ <br />
2 x − x + 2 ¡ ¢ S k = −2 <br />
<br />
3x 2 − 5x − 2 = (3 − 2γ) x 2 + 1 + (γ − 5) (x + 1) + γ 2x 2 − x + 1 <br />
γ ∈ IR<br />
<br />
<br />
87