像这种极限怎么求?lim(x→无穷)(1/x×sinx)这个怎么求,还有lim(x→无穷)(x+1)/(x^2+x+1)×(1+sinx)怎么求
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![像这种极限怎么求?lim(x→无穷)(1/x×sinx)这个怎么求,还有lim(x→无穷)(x+1)/(x^2+x+1)×(1+sinx)怎么求](/uploads/image/z/1076897-65-7.jpg?t=%E5%83%8F%E8%BF%99%E7%A7%8D%E6%9E%81%E9%99%90%E6%80%8E%E4%B9%88%E6%B1%82%3Flim%28x%E2%86%92%E6%97%A0%E7%A9%B7%29%281%2Fx%C3%97sinx%29%E8%BF%99%E4%B8%AA%E6%80%8E%E4%B9%88%E6%B1%82%2C%E8%BF%98%E6%9C%89lim%28x%E2%86%92%E6%97%A0%E7%A9%B7%29%28x%EF%BC%8B1%29%2F%28x%5E2%2Bx%2B1%29%C3%97%281%2Bsinx%29%E6%80%8E%E4%B9%88%E6%B1%82)
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