Căn( a+b ) + căn (a^2-b^2) phân tích thành nhân tử
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\(=\sqrt{a}\left(\sqrt{b}-1\right)-\left(\sqrt{b}-1\right)\)
\(=\left(\sqrt{b}-1\right)\left(\sqrt{a}-1\right)\)
\(\sqrt{ab}-\sqrt{a}-\sqrt{b}+1\)
\(=\left(\sqrt{ab}-\sqrt{a}\right)-\left(\sqrt{b}-1\right)\)
\(=\sqrt{a}\left(\sqrt{b}-1\right)-\left(\sqrt{b}-1\right)\)
\(=\left(\sqrt{b}-1\right)\left(\sqrt{a}-1\right)\)
Lời giải:
a.
\(5+\sqrt{3}+5\sqrt{3}+3=(5+5\sqrt{3})+(\sqrt{3}+3)\)
\(=5(1+\sqrt{3})+\sqrt{3}(1+\sqrt{3})=(1+\sqrt{3})(5+\sqrt{3})\)
b.
\(\sqrt{x}+\sqrt{y}+\sqrt{xy}+1=(\sqrt{x}+\sqrt{xy})+(\sqrt{y}+1)\)
\(=\sqrt{x}(1+\sqrt{y})+(\sqrt{y}+1)=(\sqrt{y}+1)(\sqrt{x}+1)\)
c.
$x-4\sqrt{x}+3=(x-\sqrt{x})-(3\sqrt{x}-3)$
$=\sqrt{x}(\sqrt{x}-1)-3(\sqrt{x}-1)$
$=(\sqrt{x}-1)(\sqrt{x}-3)$
b, \(a+b+2\sqrt{a.b}=\sqrt{a^2}+\sqrt{b^2}+2\sqrt{ab}=\left(\sqrt{a}+\sqrt{b}\right)^2\) ( Vì a, b >= 0 )
c, \(a+b-2\sqrt{a.b}=\sqrt{a^2}+\sqrt{b^2}-2\sqrt{ab}=\left(\sqrt{a}-\sqrt{b}\right)^2\)( Vì a, b >= 0 )
a, x2-7=\(\left(x-\sqrt{7}\right)\left(x+\sqrt{7}\right)\)
b, x2-3=\(\left(x-\sqrt{3}\right)\left(x+\sqrt{3}\right)\)
Học tốt!!!!!!!!!!
a: \(A=x\sqrt{x}-y\sqrt{y}+x\sqrt{y}-y\sqrt{x}\)
\(=\left(\sqrt{x}-\sqrt{y}\right)\left(x+\sqrt{xy}+y\right)+\sqrt{xy}\left(\sqrt{x}-\sqrt{y}\right)\)
\(=\left(\sqrt{x}-\sqrt{y}\right)\left(\sqrt{x}+\sqrt{y}\right)^2\)
b: \(B=5x^2-7x\sqrt{y}+2y\)
\(=5x^2-5x\sqrt{y}-2x\sqrt{y}+2y\)
\(=5x\left(x-\sqrt{y}\right)-2\sqrt{y}\left(x-\sqrt{y}\right)\)
\(=\left(x-\sqrt{y}\right)\left(5x-2\sqrt{y}\right)\)
\(\sqrt{a+b}+\sqrt{a^2-b^2}=\sqrt{a+b}+\sqrt{\left(a+b\right)\left(a-b\right)}\)
\(=\sqrt{a+b}+\sqrt{a+b}.\sqrt{a-b}=\sqrt{a+b}.\left(1+\sqrt{a-b}\right)\)