已知函数f(x)= x 2 +ax+1,x≥1 a x 2 +x+1,x<1 在R上是单调递增函数,则实数a的取值范围是______.
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【简答题】完形填空。 A rich American went into a shop in London. He wanted very much to 1 a nice-looking watch. He saw a watch and liked it so much 2 he decided to buy it. But the owner of the shop 3 five hundred do...