
Oprasi Bilangan Bulat
Presentation
•
Mathematics
•
6th Grade
•
Hard
Khamim Thohari
FREE Resource
5 Slides • 0 Questions
1
Oprasi Bilangan Bulat
by Khamim Thohari
2
Sifat-sifat Operasi Penjumlahan
Untuk semua bilangan bulat p, q, dan r berlaku sifat-sifat :
1. Tertutup
p + q adalah bilangan bulat yang tunggal
2. Komutatif
p + q = q + p
3. Asosiatif
(p + q) + r == p + (q + r)
4. Penjumlahan dengan bilangan 0 (identitas penjumlahan)
p + 0 = 0 + p = p
5. Mempunyai invers penjumlahan
3
Penjumlahan dengan bilangan negatif
•Secara urnum: Misalkan p dan q bilangan-bilangan cacah. Jika p > q (p = q + r, r bilangan asli) , maka
•p + (-q) = (q + r) + (-q) nama lain dari p
= (r + q) + (-q) Sifat komutatif penjumlahan
= r + (q + -q) Sifat asosiatif penjumlahan
= r + 0 Sifat invers penjumlahan
= r Sifat identitas penjumlahan
= p - q Sebab p = q + r
•Jadi, jika p > q, maka p + (-q) = p - q
4
​
•Untuk setiap bilangan cacah p dan q
(-p) + (-q) = -(p + q)
Bukti:
•[(-p) + (-q)] + (p + q)
= [(-p) + (-q)] + (q + p) Mengapa?
= (-P) + [((-q) + ql + P Mengapa?
= (-p) + (0 + p) Mengapa?
= (-p) + p Mengapa?
= 0 Mengapa?
•Jadi [(-p) + (-q)] + (p + q) = 0
•Ini berarti ((-p) + (-q)) invers penjumlahan dari (p + q) Karena invers penjumlahan tunggal,
maka (-p) + (-q) = -(p + q).
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Oprasi Bilangan Bulat
by Khamim Thohari
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