lim x→0 sinx/(x^2+3x)2.当x→0,下列变量中()与x为等价无穷小.A.sin^2x B.In(1+2x) C.xsin(1/x) D.根号(1+x)-根号(1-x) 3.lim x→∞ sin(1/x)=?4.lim x→∞(x-根号(x^2-1)=?
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limx→0sinx/(x^2+3x)2.当x→0,下列变量中()与x为等价无穷小.A.sin^2xB.In(1+2x)C.xsin(1/x)D.根号(1+x)-根号(1-x)3.limx→∞sin(
lim x→0 sinx/(x^2+3x)2.当x→0,下列变量中()与x为等价无穷小.A.sin^2x B.In(1+2x) C.xsin(1/x) D.根号(1+x)-根号(1-x) 3.lim x→∞ sin(1/x)=?4.lim x→∞(x-根号(x^2-1)=?
lim x→0 sinx/(x^2+3x)
2.当x→0,下列变量中()与x为等价无穷小.A.sin^2x B.In(1+2x) C.xsin(1/x) D.根号(1+x)-根号(1-x) 3.lim x→∞ sin(1/x)=?4.lim x→∞(x-根号(x^2-1)=?
lim x→0 sinx/(x^2+3x)2.当x→0,下列变量中()与x为等价无穷小.A.sin^2x B.In(1+2x) C.xsin(1/x) D.根号(1+x)-根号(1-x) 3.lim x→∞ sin(1/x)=?4.lim x→∞(x-根号(x^2-1)=?
2题选C,有界量乘以无穷小等价于无穷小 3题为0,lim[sin(1/x)]=sin[ lim(1/x) ] 4题为0,[x-根号(x^2-1)]=[x-根号(x^2)]=x-x=0
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