O-net ปี 2560-2563 เรื่องลำดับและอนุกรม (1)

ข้อสอบ O-net ปี 2560-2563 เรื่อง ลำดับและอนุกรม โดย รศ.ดร.นิศากร สังวาระนที

1 ข้อสอบเรื่ องล ำดับและอนุกรม O-net ปี 2563 an -_ 1g /n'+ 3h ) = 12h1m -13 ) A-6=7 of = 12.6-(6+3) - 6×21 = 5-24--27 # ✗ a :-D pbo µ >20 34 35%6 㱺 d-- an - any 2d= ? ✗ an - - a , -11h1) d ayay, = ¥+35d) - ☒33 d) A-45 ; Aaja, -144N = 2d 2d = 21151=1301 720=60+44 d 660--44 d i.b- =¥¥;D 19th 94 r= ? 90--9 ✗ An = a , rn -1 n=4 , a ,=qr "' A- 2 , Ag = Cyr "" 6 = ar ' _② 2-- ar - ① ② 3 = rod "nÑw① 2 = afg ⑦ r=T3 a. a 73 A- 10, a ,o=aÑ=zg(rY = 20518=2139--2181) - -11621

2 K> i 9k gwinnIswoÑ ✗ a,=k,r=k oqnrairnnrinsn-qf.ir?--1ln--8gSg=klpb?#Sn-- Nglaitanl 19/9/9 ¥ ✗ an ..a, -11h1) d Sn=nzl2a, -1M - 1) d) Atd __ Agta,, A- 3, Aja, -121 288 : hz( 212)-11h-174 ) =(a, -141 -11A, -111'd ) 10=2 + 2d 28g -.ng(¢+4m -41 ) a- (2+4)+(2+11141) 8. 2d qgg = n2 = 6+46=1521 d--4 144 - - n ' n - -12 an:O D=-2 /✗ 50,4^8%16 , - - . - go 50+48+46-1 - - - - 0 9--50 an :O D= -2 ON,niWbdrnÑM an -- a , -11h - 1) d Sn =L / a,tAn) 0=50 -11h1) 1- 2) 5g, -_ 2dg (50-10) 0=50-2h -12 = 131501=16501 2h -_ 52 n=26

3 O-net ปี 2562 →→ 512 㱺 8 -1-10 I 100 Atb -1C = 512+181-100 = 163-07 ☐ a. =3 D= , ✗☐ A ☐ a , = too D= - y an a , 1- In1) d ago =3 -1 19 (2) = 3+38 =4. Ago = 100-1191- 1) = too -19 ☒✗ = 181 ✗ 9. = -3 = (-11.2%-1) a :&, = then 9=1-1%7,2 a ,:¥= e÷÷;÷ are"!÷÷ -1%1

4 ¥+3 - - ✗ - 12-3 - - = q a=3r , b-- 3rd 3, a, b Grignon main 3, a 3.ab - - 216 313811383=216 tf 27M = 216 3 , A, b-3 y ' = 8 3 , 6 , 9 F- 2 ya , / An ✗ sn=an÷÷=9÷i ' 9=6 r=¥ = 2 Sn - - 1.53=6%-16 = 1512×32×-7-6 = 61-512-1 ) = 2- I 61,29¥ / 540 / 9 H=5o✗ ON,nrWbd9AÑM In = ng (2A, -11h1)d) 5,0=420/21500 ) -139150 ) ) = 20 (1,000+1,950) = 20 (2,950 ) - -159,000T

5 O-net ปี 2561 6%+45--145/01 An E 1500 a , - - 99 d--45 an- - a. + In - 1) d an = 99-1 In1) 1451 = 99 -145N-45 An = 45h +54 I 1,500 45h £1,44b n ← 32 . - . N - 32 2inÑÑlÑio 132%2 I.1+-0.01 ✗ ✗ - ✗ ✗ O O O O ✗ ↳ " ¥÷÷¥¥ ' - - ✗ g. = µ qr , " , ' 4 y " = A r ? 2 r = T2

6 a- T2 ✗ " s.iq 4--9 %=a;!_÷ Sigi avg.ir#gi3--aiY.--4--t3=.-i-/.-f-i9=ay-.-fg)-- = - (1-32)=-1-311 a , :-(1-B) = 1311 2×9 3×3 4×4 9qÑqgÉqq gamp 100×100 162191 100 IN ① with QIU Ignition 10,000-100=19,9002 ② Hit97 34,21 ③ with 49W ¥÷. D= 9-2=16-9=7 an = a , -11h1) di = 2-1 lhy = 2 -17h-7 An = 7h -5 180£ 9h-5£ 185 -151 185£ 7h £190 fn±27I IT fog,, , I n s 27.1

7 O-net ปี 2560 HEERE a ☐ 9µs a , agg = I -11-12+3-1--449 → Sn = ng la, + an ) = Nzlh-11 ) = 1+(41,1491-11) = 1--1 49 ( Igo ) = I -11,225 = 11,2262 8=2 0 Ay = 20 rn - A ,= ? ✗ 4,1--7 stunned an .gr " ' a , = 2012 " " ) = 20-26--201641=11,2802 ✗ S , = a , 91h5m .Ñ - 4h 11h4 Sg - - A, -1dg, D= 1 ; S , = 12-4 =-3 㱺 i. a , =-3 83=9,-1dg-1A, n=g ; 52=22-8 = -4 a.tag = -4 - 3. tag = -4 D= a , -a ,= - l - l - 3) age . -1 = -11-3--2 d+qag= 2+(-311-1) = 2-13--151