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MATEMATIKA DASAR
Aswar Amiruddin, ST., MT.
Pertemuan 4
Konsep Limit
Sub CP-MK
Memahami konsep limit di suatu titik
Indikator
Menetukan nilai limit fungsi di satu titik dan sifatnya
Konsep Limit
Misalkan f(x) suatu fungsi, c dan L bilangan real sedemikian hingga:
โ€ข Bila x dekat c tetapi tidak sama dgn c (x ๏‚น c), maka f(x) dekat ke L
โ€ข Bila x mendekati c tetapi x ๏‚น c, maka f(x) mendekati L
โ€ข Misalkan f(x) dapat kita buat sedekat mungkin ke L dg membuat x
cukup dekat c tetapi tidak sama dengan c
โ€ข Maka dapat dikatakan bahwa limit f(x) bila x mendekati c adalah L,
๐ฅ๐ข๐ฆ
๐’™โ†’๐’„
๐’‡ (๐’™) = ๐‘ณ
Konsep Limit
Perhatikan fungsi berikut : lim
๐‘ฅโ†’๐‘
๐‘“(๐‘ฅ) =
๐’™๐Ÿโˆ’๐Ÿ
๐’™โˆ’๐Ÿ
, terdefinisi untuk setiap
x ฯต R kecuali untuk x = 1, fungsi tidak terdefinisi jika x=1, akan
tetapi dengan mengambil nilai mendekati 1 maka fungsi di atas
terdefinisi.
Konsep Limit
Dari tabel di atas dan grafik disamping terlihat
bahwa f(x) mendekati 2 jika x mendekati 1 Secara
matematis dapat dituliskan Sebagai berikut
๐ฅ๐ข๐ฆ
๐’™โ†’๐Ÿ
๐’™๐Ÿ โˆ’ ๐Ÿ
๐’™ โˆ’ ๐Ÿ
= ๐Ÿ
Pengertian limit secara intuitif
Kita tuliskan lim
๐‘ฅโ†’๐‘
๐‘“(๐‘ฅ) = ๐ฟ apabila
jika x dekat ke c, maka nilai f(x) dekat ke L
lim
๐‘ฅโ†’๐‘
๐‘“(๐‘ฅ) disebut โ€œlimit f di cโ€.
Bilangan L merupakan nilai limit tersebut.
Contoh
lim
๐‘ฅโ†’๐‘
๐‘“(๐‘ฅ) =
๐’™๐Ÿ โˆ’ ๐Ÿ
๐’™ โˆ’ ๐Ÿ
Arti โ€mendekatiโ€ pada konsep limit, bisa dari kiri titik c atau dari
kanan titik c.
Dengan kata lain, nilai limit f (x) untuk x mendekati c ada, jika
limit kiri dan limit kanan ada.
Limit Kanan dan Limit Kiri
Limit kanan ๐‘™๐‘–๐‘š
๐‘ฅโ†’๐‘+
๐‘“(๐‘ฅ) = ๐ฟ berarti
jika x > c dan dekat ke c, maka f(x) dekat ke L.
Limit kanan ๐‘™๐‘–๐‘š
๐‘ฅโ†’๐‘โˆ’
๐‘“(๐‘ฅ) = ๐ฟ berarti
jika x < c dan dekat ke c, maka f(x) dekat ke L.
Limit Kanan dan Limit Kiri
Bilakah Limit Ada/Tidak Ada?
Limit fungsi f di c ada jika dan hanya jika limit kanan dan limit kiri f di
c ada dan nilainya sama dengan L (perhatikan definisi limit).
Limit f di c tidak ada bila salah satu di antara beberapa kemungkinan
berikut terjadi:
1. Limit kanan dan limit kiri f di c ada, tetapi nilainya tidak sama.
2. Limit kanan atau limit kiri f di c tidak ada, karena
a. Nilai f di dekat c menuju tak terhingga.
b. Nilai f di dekat c berosilasi.
Limit Fungsi
Bila sebelumnya kita telah mencoba memaknai limit fungsi di suatu titik
secara intuitif, maka skrg kita akan mendefinisikannya secara formal.
Definisi: ๐‘™๐‘–๐‘š
๐‘ฅโ†’๐‘
๐‘“(๐‘ฅ) = ๐ฟ jika dan hanya jika:
โ€œuntuk setiap ฮต > 0 terdapat ฮด > 0 sehingga:
jika 0 < | x โ€“ c | < ฮด, maka | f(x) โ€“ L | < ฮต.โ€
Pertemuan 4
Pertemuan 4
Pertemuan 4
Pertemuan 4

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Pertemuan 4

  • 3. Sub CP-MK Memahami konsep limit di suatu titik Indikator Menetukan nilai limit fungsi di satu titik dan sifatnya
  • 4. Konsep Limit Misalkan f(x) suatu fungsi, c dan L bilangan real sedemikian hingga: โ€ข Bila x dekat c tetapi tidak sama dgn c (x ๏‚น c), maka f(x) dekat ke L โ€ข Bila x mendekati c tetapi x ๏‚น c, maka f(x) mendekati L โ€ข Misalkan f(x) dapat kita buat sedekat mungkin ke L dg membuat x cukup dekat c tetapi tidak sama dengan c โ€ข Maka dapat dikatakan bahwa limit f(x) bila x mendekati c adalah L, ๐ฅ๐ข๐ฆ ๐’™โ†’๐’„ ๐’‡ (๐’™) = ๐‘ณ
  • 5. Konsep Limit Perhatikan fungsi berikut : lim ๐‘ฅโ†’๐‘ ๐‘“(๐‘ฅ) = ๐’™๐Ÿโˆ’๐Ÿ ๐’™โˆ’๐Ÿ , terdefinisi untuk setiap x ฯต R kecuali untuk x = 1, fungsi tidak terdefinisi jika x=1, akan tetapi dengan mengambil nilai mendekati 1 maka fungsi di atas terdefinisi.
  • 6. Konsep Limit Dari tabel di atas dan grafik disamping terlihat bahwa f(x) mendekati 2 jika x mendekati 1 Secara matematis dapat dituliskan Sebagai berikut ๐ฅ๐ข๐ฆ ๐’™โ†’๐Ÿ ๐’™๐Ÿ โˆ’ ๐Ÿ ๐’™ โˆ’ ๐Ÿ = ๐Ÿ
  • 7.
  • 8. Pengertian limit secara intuitif Kita tuliskan lim ๐‘ฅโ†’๐‘ ๐‘“(๐‘ฅ) = ๐ฟ apabila jika x dekat ke c, maka nilai f(x) dekat ke L lim ๐‘ฅโ†’๐‘ ๐‘“(๐‘ฅ) disebut โ€œlimit f di cโ€. Bilangan L merupakan nilai limit tersebut. Contoh lim ๐‘ฅโ†’๐‘ ๐‘“(๐‘ฅ) = ๐’™๐Ÿ โˆ’ ๐Ÿ ๐’™ โˆ’ ๐Ÿ
  • 9.
  • 10. Arti โ€mendekatiโ€ pada konsep limit, bisa dari kiri titik c atau dari kanan titik c. Dengan kata lain, nilai limit f (x) untuk x mendekati c ada, jika limit kiri dan limit kanan ada. Limit Kanan dan Limit Kiri Limit kanan ๐‘™๐‘–๐‘š ๐‘ฅโ†’๐‘+ ๐‘“(๐‘ฅ) = ๐ฟ berarti jika x > c dan dekat ke c, maka f(x) dekat ke L. Limit kanan ๐‘™๐‘–๐‘š ๐‘ฅโ†’๐‘โˆ’ ๐‘“(๐‘ฅ) = ๐ฟ berarti jika x < c dan dekat ke c, maka f(x) dekat ke L. Limit Kanan dan Limit Kiri
  • 11. Bilakah Limit Ada/Tidak Ada? Limit fungsi f di c ada jika dan hanya jika limit kanan dan limit kiri f di c ada dan nilainya sama dengan L (perhatikan definisi limit). Limit f di c tidak ada bila salah satu di antara beberapa kemungkinan berikut terjadi: 1. Limit kanan dan limit kiri f di c ada, tetapi nilainya tidak sama. 2. Limit kanan atau limit kiri f di c tidak ada, karena a. Nilai f di dekat c menuju tak terhingga. b. Nilai f di dekat c berosilasi.
  • 12. Limit Fungsi Bila sebelumnya kita telah mencoba memaknai limit fungsi di suatu titik secara intuitif, maka skrg kita akan mendefinisikannya secara formal. Definisi: ๐‘™๐‘–๐‘š ๐‘ฅโ†’๐‘ ๐‘“(๐‘ฅ) = ๐ฟ jika dan hanya jika: โ€œuntuk setiap ฮต > 0 terdapat ฮด > 0 sehingga: jika 0 < | x โ€“ c | < ฮด, maka | f(x) โ€“ L | < ฮต.โ€

Editor's Notes

  1. Are your classroom colors different than what you see in this template? Thatโ€™s OK! Click on Design -> Variants (the down arrow) -> Pick the color scheme that works for you! Feel free to change any โ€œYou willโ€ฆโ€ and โ€œI willโ€ฆโ€ statements to ensure they align with your classroom procedures and rules!