Cho hàm số $y=f\left( x \right)=a{{x}^{3}}+b{{x}^{2}}+cx+d$ có đồ...

Điều kiện:
Ta xét:


Khi đó$$ $y=\dfrac{\left( {{x}^{2}}-2x \right)\sqrt{2-x}}{\left( x-3 \right)\left[ {{f}^{2}}\left( x \right)-f\left( x \right) \right]}=\dfrac{\left( {{x}^{2}}-2x \right)\sqrt{2-x}}{\left( x-3 \right)f\left( x \right)\left[ f\left( x \right)-1 \right]}=\dfrac{x\left( x-2 \right)\sqrt{2-x}}{\left( x-3 \right)a\left( x-{{x}_{1}} \right)\left( x-{{x}_{2}} \right)\left( x-{{x}_{3}} \right)a{{x}^{2}}\left( x-{{x}_{4}} \right)}=\dfrac{\left( x-2 \right)\sqrt{2-x}}{{{a}^{2}}x\left( x-3 \right)\left( x-{{x}_{1}} \right)\left( x-{{x}_{2}} \right)\left( x-{{x}_{3}} \right)\left( x-{{x}_{4}} \right)}x\le 2x=0;x={{x}_{1}};x={{x}_{2}}$