Đáp án:
B = √24 + 6 /√(2/3) + 10 /(√6 -1)
B = √24 + √(6².2 /3) + 10.(√6+1) /(√6²-1²)
B = √24 + √24 + 10.(√6+1) /5
B = 2√24 + 2.(√6 +1)
B = 2√24 + 2√6 + 2
B = 2√(2².6) + 2√6 + 2
B = 4√6 + 2√6 + 2
B = 6√6 + 2
Vay bieu thuc B = 6√6 + 2
A = √(6- 2√5) - √(9- 4√5) - 1 √(6[1] - 2 . √5[a] . 1[b]) √(9[1] - 2 . 2[a] . √5[b])
A = √(√5 -1)² - √(√5 -2)² - 1 ( Cong lai sao cho no = so tren[1]) ( neu bieu thuc am thi dung am)
A = √5 -1 - √5 +2 - 1
A = 0
Vay bieu thuc A = 0
Chuc ban hoc tot :D
