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设a>1,f(t)=at-at在(-∞,+∞)内的驻点为t(a),问a为何值时,t(a)最小?并求出最小值.
设a>1,f(t)=at-at在(-∞,+∞)内的驻点为t(a),问a为何值时,t(a)最小?并求出最小值.
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设a>1,f(t)=at-at在(-∞,+∞)内的驻点为t(a),问a为何值时,t(a)最小?并求出最小值.
设a={2,-1,-2},b={1,1,x},问z为何值时(a,b)最小,并求出此最小值.
(本小题满分12分)如下图,某小区准备绿化一块直径为![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() (1)试用 (2)若 最小?并求出这个最小值. |