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Phân tích phương trình:
\(\frac{x^3+x^2-4\cdot x-4}{x^3+8\cdot x^2+17\cdot x+10}=\frac{x^2\cdot\left(x+1\right)-4\cdot\left(x+1\right)}{x^2\cdot\left(x+1\right)+7\cdot x\cdot\left(x+1\right)+10\cdot\left(x+1\right)}\)
\(=\frac{\left(x+1\right)\cdot\left(x^2-4\right)}{\left(x+1\right)\cdot\left(x^2+7\cdot x+10\right)}\)
\(=\frac{\left(x+1\right)\cdot\left(x+2\right)\cdot\left(x-2\right)}{\left(x+1\right)\cdot\left(x+2\right)\cdot\left(x+5\right)}=\frac{x-2}{x+5}\)
Vậy \(a=-2;b=5\)
\(\frac{x^3+x^2-4x-4}{x^3+8x^2+17x+10}=\frac{x^2\left(x+1\right)-4\left(x+1\right)}{x^2\left(x+1\right)+7x\left(x+1\right)+10\left(x+1\right)}\)
\(=\frac{\left(x+1\right)\left(x^2-4\right)}{\left(x+1\right)\left(x^2+7x+10\right)}=\frac{\left(x+2\right)\left(x-2\right)}{x\left(x+2\right)+5\left(x+2\right)}\)
\(=\frac{\left(x+2\right)\left(x-2\right)}{\left(x+2\right)\left(x+5\right)}=\frac{x-2}{x+5}\Rightarrow a=-2;b=5\)
\(\Rightarrow\)\(a+b=-2+5=3\)
\(\frac{x^3+x^2-4x-4}{x^3+8x^2+17x+10}\)
\(=\frac{x^2\left(x+1\right)-4\left(x+1\right)}{x^3+x^2+7x^2+7x+10x+10}\)
\(=\frac{\left(x^2-4\right)\left(x+1\right)}{\left(x+1\right)\left(x^2+7x+10\right)}\)
\(=\frac{x^2-4}{x^2+7x+10}\)
\(=\frac{x^2-4}{x^2+5x+2x+10}\)
\(=\frac{\left(x-2\right)\left(x+2\right)}{x\left(x+5\right)+2\left(x+5\right)}\)
\(=\frac{x-2}{x+5}\)
a) 2x2+3x-5=0
=> 2x2+5x-2x-5=0
=> x(2x+5)-(2x-5)=0
=> (2x-5)(x-1)=0
=> 2x-5=0, x-1=0
=> x=5/2; 1
\(2x^2+3x-5=0< =>2x^2-2+3x-3=0\)
\(< =>2\left(x+1\right)\left(x-1\right)-3\left(x-1\right)=0\)
\(< =>\left(x-1\right)\left(2x-1\right)=0< =>\orbr{\begin{cases}x=1\\x=\frac{1}{2}\end{cases}}\)
f(0)=-4/10
a/b=-4/10=-2/5
f(1)=-6/26=-3/13=(a+1)/(b+1)
5a=-2b
a/-2=b/5=(a+b)/3
13a+13=-3b-3
15a=-6b
26a=-6b-6
11a=-6
a+b=-3/2.a=3/2.6/11=9/11
a+b=9/11