2(5分)已知等差数列{an}的前n项和为Sn,并且a2=2,S5=15,数列{bn}满足 n+2 b n=2 n+2/2n n∈N+) n∈N),记集合 M =n 2sn(2-bn)/n+2 2S,(2-b ≥,n∈ n+2,若M的子集个数为16,则实数λ的取值范围为. 3(5分)已知等差数列{an}的前n项和为Sn,并且a2=2,S5=15,数列{bn}满足 b...
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已知:如图1.M是定长线段AB上一定点.C.D两点分别从M.B出发以1cm/s.3 cm/s的速度沿直线BA向左运动.运动方向如箭头所示(C在线段AM上.D在线段BM上)(1)若AB=10cm,当点C.D运动了2s.求AC+MD的值.(2)若点C.D运动时. 总有MD=3AC.直接填空:AM= AB.的条件下.N是直线AB上一点.且AN-BN
harmrnl. Bn+ 2yamnl2, I hav2 +ry 2 r.r 15 minn+2s 2v2ry m.rning. My nar2n+s +hink rnnning is g..d r.r my h2al+h, 3 I d.n'+ lik2 rnnning. I wan+ +. 4 my +hings in +h2 righ+ nla.2s. I hav2 +ry 5 my nar2n+s +idy. Ar+2r s.h..l, I ....
BNXL-3/16AL BNXL-5/16 BNXL-5/32 BNXL-7/32 BNXL-SF-7/32 BOE2050-0001 BOMR8-10 BP06E8-2S BP150 BP258A2G1 BP9823-2G BPA1-05-06 BPEU0807 BP-EU08-07 BPEU6-10 BPF-1/2 BPF-1/4 BPF-1-1/4 BPF1-4 BPF-15/16
71. A+ 2igh+ h.nrs .r 100dB r.r 15 minn+2s. Th2 s.nnd .r a bnsy r.ad is ab.n+ 85dB and +h2 s.nnd .r a r..k ..n.2r+ .an b2 ab.n+ 100dB. L.nd n.is2 is harmrnl +. +h2 inn2r 2ar. M.s+ .r ns ar2 b.rn wi+h ab.n+ 16,000 hair...
15. —Th2 +rain +. Tianshni is g.ing +. l2av2 in 30 minn+2s. Bn+ Oliv2 s+ill hasn'+ ..m2. —___. Sh2 will b2 h2r2 s..n. A. D2ar m2 B. C.m2 .n C. D.n'+ w.rry D. N2v2r —___ —___ 相关知识...