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ducmanh97531
2 năm trước
cho 2 biểu thức A = x+ √x +1 / √x+2 và B = 2 √x / √x-1 - x- √x+2 / x- √x (với x>0 , x khác 1 ) a) chứng minh B= √x+2 / √x b) cho P=A.B so sánh P với 3
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