Toán Lớp 9: √7+ √5 √7- √5 + √7- √5 /√7+ √5
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Toán Lớp 9: √7+ √5 √7- √5 + √7- √5 /√7+ √5
Comments ( 2 )
={(\sqrt{7}+\sqrt{5})^2}/{(\sqrt{7})^2-(\sqrt{5})^2}+{(\sqrt{7}-\sqrt{5})^2}/{(\sqrt{7})^2-(\sqrt{5})^2}
={7+2\sqrt{35}+5+7-2\sqrt{35}+5}/{7-5}
=24/2
=12