Bài tập tết TvT giúp với

T

tranhainam1801

Có [tex]c^2=ab[/tex]
\Rightarrow [tex]c^2[/tex](b-a)-[tex]a^3[/tex]=ab(b-a)-[tex]a^3[/tex]
\Rightarrow [tex]a^2[/tex]b-[tex]a^3[/tex]+b[tex]c^2[/tex]-a[tex]c^2[/tex]=a[tex]b^2[/tex]-[tex]a^3[/tex]
\Rightarrow([tex]a^2[/tex]+[tex]c^2[/tex])(b-a)=a([tex]b^2[/tex]-[tex]a^2[/tex])
\Rightarrow [tex]\frac{b^2-a^2}{a^2+c^2}=\frac{b-a}{a}[/tex]
 
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