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![](https://rs.olm.vn/images/avt/0.png?1311)
vì abc=105 nên thay 105 bằng abc ta được:
\(s=\frac{abc}{a\left(bc+b+1\right)}\)+\(\frac{b}{bc+b+1}\)+\(\frac{a}{ab+a+abc}\)
\(s=\frac{bc}{bc+b+1}\)+\(\frac{b}{bc+b+1}\)+\(\frac{1}{b+1+bc}\)=\(\frac{bc+b+1}{bc+b+1}\)=1
Cho mình 1 l i k e nha..............
![](https://rs.olm.vn/images/avt/0.png?1311)
\(s=\frac{105}{105+ab+a}+\frac{ab}{a.\left(bc+b+1\right)}+\frac{a}{ab+a+105}=\frac{105}{105+ab+a}+\frac{ab}{abc+ab+a}+\frac{a}{ab+a+105}\)
\(s=\frac{105}{105+ab+a}+\frac{ab}{105+ab+a}+\frac{a}{ab+a+105}=\frac{105+ab+a}{105+ab+a}=1\)
Thay 105 = abc vào biểu thức S ta được:
\(S=\frac{abc}{a.\left(bc+b+1\right)}+\frac{b}{bc+b+1}+\frac{a}{ab+a+abc}=\frac{bc}{bc+b+1}+\frac{b}{bc+b+1}+\frac{1}{bc+b+1}=\frac{bc+b+1}{bc+b+1}=1\)
Vậy S=1
![](https://rs.olm.vn/images/avt/0.png?1311)
Vì abc = 105 nên thay 105 bằng abc, ta được:
\(S=\dfrac{abc}{a\left(bc+b+1\right)}+\dfrac{b}{bc+b+1}+\dfrac{a}{ab+a+abc}\)
\(S=\dfrac{bc}{bc+b+1}+\dfrac{b}{bc+b+1}+\dfrac{1}{b+1+c}=\dfrac{bc+b+1}{bc+b+1}=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Vì abc=105 nên thay 105 bằng abc ta được:
\(S=\dfrac{abc}{a\left(bc+b+1\right)}\)+\(\dfrac{b}{bc+b+1}\)+\(\dfrac{a}{ab+a+abc}\)
\(S=\dfrac{bc}{bc+b+1}\)+\(\dfrac{b}{bc+b+1}\)+\(\dfrac{1}{b+1+bc}\)=\(\dfrac{bc+b+1}{bc+b+1}\)=1
\(S=\frac{105}{abc+ab+a}+\frac{b}{bc+b+1}+\frac{a}{ab+a+105}\)
\(S=\frac{abc}{abc+ab+a}+\frac{b}{bc+b+1}+\frac{a}{ab+a+abc}\)
\(S=\frac{abc}{a\left(bc+b+1\right)}+\frac{b}{bc+b+1}+\frac{a}{ab+a+abc}\)
\(S=\frac{bc+b+1}{bc+b+1}=1\)
1 nha bn