\(\left(4+\sqrt{15}\right)\cdot\left(\sqrt{10}-\sqrt{6}\right)\cdot\sqrt{4-\sqrt{15}}\)
\(=\left(4+\sqrt{15}\right)\left(8-2\sqrt{15}\right)\)
=32-30
=2
(4+√15)(√10-√6)×√4-√15
(\(\sqrt{10}-\sqrt{6}\)).(4+\(\sqrt{15}\)).\(\sqrt{4-\sqrt{ }15}\)
2) \(\dfrac{\sqrt{108}}{\sqrt{3}}\)
13) \(\sqrt{8-2\sqrt{15}}\)- \(\sqrt{23-4\sqrt{15}}\)
14) ( 4+ \(\sqrt{15}\) ) (\(\sqrt{10}\)- \(\sqrt{6}\) ) \(\sqrt{4-\sqrt{15}}\)
(4@21-4@15-@14+@10)/(4@6-2+4@15-@10)
(Coi như dấu @ là dấu căn hai nhé)
\(\left(\sqrt{6}+\sqrt{10}\right).\sqrt{4-\sqrt{15}}\)
\(\left(3+\sqrt{15}\right).\left(\sqrt{10}-2\right).\sqrt{3-\sqrt{5}}\)
\(\left(4+\sqrt{15}\right).\left(\sqrt{10}-\sqrt{6}\right).\sqrt{4-\sqrt{15}}\)
(4+căn 15)(căn 10 - căn 6)căn lồng 4 trừ căn 15
Cho A=4a
Tính A với a=(4+√15)(√10-√6)(√4-√15)
B1:CHƯNG MINH ĐẲNG THỨC:
A)\(\sqrt{10}-\sqrt{6}=2\sqrt{4-\sqrt{15}}\)
B)\(\left(\sqrt{10}-\sqrt{6}\right)X\left(4+\sqrt{15}\right)X\sqrt{4-\sqrt{15}=2}\)
tính giá trị các biểu thức:
B=(4+\(\sqrt{15}\))\(\left(\sqrt{10}-\sqrt{6}\right)\sqrt{4-\sqrt{15}}\)
