P = a/(√a -1) – (20- √a)/(a- √a)
a) Rút gọn
b) Tính P khi a= 3- √8
c) Tìm a để P < 0
P = a/(√a -1) – (20- √a)/(a- √a) a) Rút gọn b) Tính P khi a= 3- √8 c) Tìm a để P < 0
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