
Materi Bilangan Bulat
Presentation
•
Mathematics
•
7th Grade
•
Practice Problem
•
Hard
Maulidya Rahmawati
Used 9+ times
FREE Resource
8 Slides • 0 Questions
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1
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Bilangan Bulat
Pengertian
Bilangan bulat terdiri dari
bilangan bulat negatif dan
bilangan cacah, ditulis:
3
3
B = {…,-3, -2, -1, 0, 1, 2, 3, 4, …}
Pada garis bilangan
0
-1
-2
-3
1
2
3
4
-4
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4
Keterangan :
1. Bilangan bulat negatif merupakan
kelompok bilangan yang terletak
disebelah kiri nol.
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5
2. Pada garis bilangan mendatar, jika
bilangan a terletak di sebelah kiri b
maka a lebih kecil dari b, ditulis a < b
atau b > a (dibaca b lebih besar dari a)
3. Untuk a < b maka :
Perubahan dari a ke b disebut naik
Perubahan dari b ke a disebut turun
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Operasi Bilangan Bulat
1. Penjumlahan
a. Tertutup a + b bilangan bulat
b. Komutatif a + b = b + a
c. Asosiatif (a + b) + c = a + (b + c)
2. Pengurangan
Lawan (invers) a – b = a + (-b)
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3. Perkalian
a. Tertutup a x b bilangan bulat
b. Komutatif a x b = b x a
c. Asosiatif (a x b) x c = a x (b x c)
d. Unsur identitas a x 1 = a
e. Distributif a (b + c) = ab + ac
a (b - c) = ab – ac
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4. Pembagian
Kebalikan (invers) dari perkalian
a : b = a x 1/b
1
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