Bài 1. Rút gọn: A=(√6 + √10). √4-√15 B = √3+2 √3-2 √3-2 8√6-8√3 + √3+2 √2-1

Bài 2. Cho hình thang ABCD (AB // CD) có AB=1cm, CD = 5cm và C = 30°, D = 60°. Tính diện tích hình thang ABCD.

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