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1.a) (\(\sqrt{12}\) -3\(\sqrt{75}\))\(\sqrt{3}\)
=\(\sqrt{12}\).\(\sqrt{3}\)-3\(\sqrt{75}\).\(\sqrt{3}\)
=\(2\sqrt{3}.\sqrt{3}-3.5\sqrt{3}.\sqrt{3}\)
=2.3-15.3
=6-45
= -39
b)\(\left(\sqrt{18}-4\sqrt{72}\right)2\sqrt{2}\)
\(\left(3\sqrt{2}-4.6\sqrt{2}\right).2\sqrt{2}\)
\(\left(3\sqrt{2}-24\sqrt{2}\right).2\sqrt{2}\)
\(3\sqrt{2}.2\sqrt{2}-24\sqrt{2}.2\sqrt{2}\)
= 6.2-48.2 = 12-96= -84
d)\(\left(\sqrt{3}+2\right)\left(\sqrt{3}-5\right)\)
\(3-5\sqrt{3}+2\sqrt{3}-10\)
\(-7-3\sqrt{3}\)
\(\)c)\(\left(\sqrt{6}-2\right)\left(\sqrt{6}+7\right)\)
\(\Leftrightarrow6+6\sqrt{7}-2\sqrt{6}-14\)
\(\Leftrightarrow-8+5\sqrt{6}\)
d)\(\left(\sqrt{3}+2\right)\left(\sqrt{3}-5\right)\)
\(\Leftrightarrow3-5\sqrt{3}+2\sqrt{3}-3\)
\(\Leftrightarrow-3\sqrt{3}\)
1. c)\(\left(\sqrt{6}-2\right)\left(\sqrt{6}+7\right)\)
\(\Leftrightarrow6+7\sqrt{6}-2\sqrt{6}-14\)
\(\Leftrightarrow-8+5\sqrt{6}\)
d)\(\left(\sqrt{3}+2\right)\left(\sqrt{3}-5\right)\)
\(\Leftrightarrow3-5\sqrt{3}+2\sqrt{3}-3\)
\(\Leftrightarrow-3\sqrt{3}\)
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