Câu trả lời:
\(\sqrt{2-\sqrt{3}}\)+\(\sqrt{2+\sqrt{3}}\)
=2ʌ2-\(\sqrt{3}\)ʌ2
=4-3
=1
√20-√45+3√18+√72
=2√5-3√5+9√2+6√2
=-√5+15√2
cho tam giac ABC vuong tai A,duong cao AH 1,HB=2,HC=6 a,tinh AB, AH b,goc C va gocB cua tam giac ABC 2,goi E,Flan luot la hinh chieu cua H tren AB,AC.chung minhAB mu 3 tren AC mu 3=BE tren CF. giai cau 2 ho minh nhe canh nhanh cang tot thank ae.