1.计算limn→正无穷 [1+3+..+(2n-1)]/(2n^2-n-1)=2.函数fx=arccosx(1/2<x<1)的值域是3等差数列{an}前n项和为sn a5=6 s9=4已知an是等比数列 a2=2 a5=1/4则lim n→正无穷 (a1a2+a2a3+……+ana(n+1))=5若sin(π/2x+π/4)=
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![1.计算limn→正无穷 [1+3+..+(2n-1)]/(2n^2-n-1)=2.函数fx=arccosx(1/2<x<1)的值域是3等差数列{an}前n项和为sn a5=6 s9=4已知an是等比数列 a2=2 a5=1/4则lim n→正无穷 (a1a2+a2a3+……+ana(n+1))=5若sin(π/2x+π/4)=](/uploads/image/z/10096949-29-9.jpg?t=1.%E8%AE%A1%E7%AE%97limn%E2%86%92%E6%AD%A3%E6%97%A0%E7%A9%B7+%5B1%2B3%2B..%2B%282n-1%29%5D%2F%282n%5E2-n-1%29%3D2.%E5%87%BD%E6%95%B0fx%3Darccosx%EF%BC%881%2F2%EF%BC%9Cx%EF%BC%9C1%EF%BC%89%E7%9A%84%E5%80%BC%E5%9F%9F%E6%98%AF3%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ban%7D%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BAsn+a5%3D6+s9%3D4%E5%B7%B2%E7%9F%A5an%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97+a2%3D2+a5%3D1%2F4%E5%88%99lim+n%E2%86%92%E6%AD%A3%E6%97%A0%E7%A9%B7+%EF%BC%88a1a2%2Ba2a3%2B%E2%80%A6%E2%80%A6%2Bana%28n%2B1%29%EF%BC%89%3D5%E8%8B%A5sin%28%CF%80%2F2x%2B%CF%80%2F4%29%3D)
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1.计算limn→正无穷 [1+3+..+(2n-1)]/(2n^2-n-1)=2.函数fx=arccosx(1/2<x<1)的值域是3等差数列{an}前n项和为sn a5=6 s9=4已知an是等比数列 a2=2 a5=1/4则lim n→正无穷 (a1a2+a2a3+……+ana(n+1))=5若sin(π/2x+π/4)=
1.计算limn→正无穷 [1+3+..+(2n-1)]/(2n^2-n-1)=
2.函数fx=arccosx(1/2<x<1)的值域是
3等差数列{an}前n项和为sn a5=6 s9=
4已知an是等比数列 a2=2 a5=1/4则lim n→正无穷 (a1a2+a2a3+……+ana(n+1))=
5若sin(π/2x+π/4)=根号2/2 x∈(-2,2) 则x=
1.计算limn→正无穷 [1+3+..+(2n-1)]/(2n^2-n-1)=2.函数fx=arccosx(1/2<x<1)的值域是3等差数列{an}前n项和为sn a5=6 s9=4已知an是等比数列 a2=2 a5=1/4则lim n→正无穷 (a1a2+a2a3+……+ana(n+1))=5若sin(π/2x+π/4)=
1,1/2
2,(0,pi/3)
3,54
4,16
5,题目不明确.除号下最好加上括号表示次序
limn→正无穷 n[(1+1/n)∧n-e]
1.计算limn→正无穷 [1+3+..+(2n-1)]/(2n^2-n-1)=2.函数fx=arccosx(1/2<x<1)的值域是3等差数列{an}前n项和为sn a5=6 s9=4已知an是等比数列 a2=2 a5=1/4则lim n→正无穷 (a1a2+a2a3+……+ana(n+1))=5若sin(π/2x+π/4)=
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