Toán Lớp 9: (3*căn bậc hai(5) + căn bậc hai(2)) * (3*căn bậc hai(5) – căn bậc hai(2))
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Toán Lớp 9: (3*căn bậc hai(5) + căn bậc hai(2)) * (3*căn bậc hai(5) – căn bậc hai(2))
Comments ( 2 )
$(3\sqrt{5}+\sqrt{2}).(3\sqrt{5}-\sqrt{2})$
$=(3\sqrt{5})^2-(\sqrt{2})^2$
$=45-2$
$=43$