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giúp với T.T---- toán 10

tìm GTLN và GTNN của hàm số: y = $\frac{2x^2 - x + 2}{2x - 1}$với $x € (1/2 ; +∞)$
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nhi thuc niu ton

cho (x-1/x)^n co tong 3 he so dau bang 28. tim so hang thu 5. giup mk vs.vi khong tim thay nhi thuc niu ton nen mk lay dai cai tag nay. cac p...
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Khó quá! help

Cho số tự nhiên $n\geqslant 2$,chứng minh đẳng thức$(\frac{C^{0}_{n}}{1})^{2}+(\frac{C^{1}_{n}}{2})^{2}+...+(\frac{C^{n}_{n}}{n+1})^{2}=\frac{C^{n+1}_{2n+2}-1}{(n+1)^{2}}$
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Tìm GTNN của:

1. $ y = \frac{x}{2} + \frac{2}{x - 1} $ với $x > 1$2. $y =x+1+\frac{4}{x-3} $ với $ x > 3$
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nhị thức newton. tính giá trị

$A=\frac{1}{1\times 2}C^{0}_{2n+1} + \frac{1}{2\times 3}C^{1}_{2n+1} + ....+\frac{1}{(2n+2)(2n+3)}C^{2n+1}_{2n+1} $Bài này làm bt thì không khó....

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