lim x→n (√n+1-√n)*√(n+1/2)lim x n→∞ (√n+1-√n)*√(n+1/2)

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limx→n(√n+1-√n)*√(n+1/2)limxn→∞(√n+1-√n)*√(n+1/2)limx→n(√n+1-√n)*√(n+1/2)limxn→∞(√n+1-√n)*√(n+1/2)li

lim x→n (√n+1-√n)*√(n+1/2)lim x n→∞ (√n+1-√n)*√(n+1/2)
lim x→n (√n+1-√n)*√(n+1/2)
lim x n→∞ (√n+1-√n)*√(n+1/2)

lim x→n (√n+1-√n)*√(n+1/2)lim x n→∞ (√n+1-√n)*√(n+1/2)
lim x n→∞ (√n+1-√n)*√(n+1/2)
乘以(√n+1+√n)再除以(√n+1+√n)得
lim x n→∞ (√n+1-√n)*√(n+1/2)=lim x n→∞√(n+1/2)/(√n+1+√n),分子分母同除以√n
原式=lim x n→∞√(1+1/2n)/(√n+1/n+1)=1/(1+1)=1/2.核心就是构造1/n