Cho biếu thức A=\frac{1}{\sqrt{a}-1}-\frac{1}{\sqrt{a}-1}+1

a) Rút gọn ( mình tính ra = a-1 , k biết có đúng k?)
b) Tìm a thuộc Z để A thuộc Z
Bạn xem lại đề nhé , hai số đầu tiên bằng nhau kìa –  GreenmjlkTea FeelingTea 18-06-13 08:40 PM

bị xóa vì bị trùng bởi Đức Vỹ 27-10-13 01:26 PM

Câu hỏi này có nội dung hoàn toàn trùng với câu hỏi đã có.

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