1. 4√125 - 3√20 - 5√8 =

2. 3√150 – 7√54 – 9√48 =
3. ( √2 + √3 ) ( 2√2 – 7 ) =

Mohon dibantu ya teman teman..

1. 4√125 – 3√20 – 5√8 =

$4 sqrt{125} - 3 sqrt{20} - 5 sqrt{8} \ = 4 sqrt{25 times 5} - 3 sqrt{4 times 5} - 5 sqrt{4 times 2} \ = 4 times 5 sqrt{5} - 3 times 2 sqrt{5} - 5 times 2 sqrt{2} \ = 20 sqrt{5} - 6 sqrt{5} - 10 sqrt{2} \ = 14 sqrt{5} - 10 sqrt{2}$
$3 sqrt{150} - 7 sqrt{54} - 9 sqrt{48} \ = 3 sqrt{25 times 6} - 7 sqrt{9 times 6} - 9 sqrt{16 times 3} \ = 3 times 5 sqrt{6} - 7 times 3 sqrt{6} - 9 times 4 sqrt{3} \ = 15 sqrt{6} - 21 sqrt{6} - 36 sqrt{3} \ = - 6 sqrt{6} - 36 sqrt{3}$
$( sqrt{2} + sqrt{3} )(2 sqrt{2} - 7) \ = (2 times 2 sqrt{2} ) + ( sqrt{2} times - 7) + ( sqrt{3} times 2 sqrt{2} ) + (sqrt{3} times - 7) \ = 2 sqrt{4} - 7 sqrt{2} + 2 sqrt{6} - 7 sqrt{3} \ = 4 - 7 sqrt{2} + 2 sqrt{6} - 7 sqrt{3}$
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