
bilangan bulat
Presentation
•
Mathematics, Professional Development
•
7th - 9th Grade
•
Hard
A.SYARMADANI undefined
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9 Slides • 2 Questions
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bilangan bulat
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Pengertian bilangan bulat
Bilangan bulat adalah bilangan yang dapat dituliskan tanpa komponen desimal atau pecahan.
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Jenis-jenis Bilangan Bulat
Bilangan bulat terdiri atas bilangan bulat genap dan bilangan bulat ganjil.
Contoh Bilangan bulat genap adalah -8,-6,-4,-2,0,2 sedangkan bilngan bulat ganjil adalah -7,-5,-3,-1,1,3,5
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Operasi hitung pada bilangan bulat :
.Penjumlahan dan sifat-sifatnya
1. Sifat Asosiatif
(a+b)+ c =a ( b + c)
contoh (5 + 3) + 4 = 5 + (3 + 4) = 12
2.Sifat Komutatif
a + b = b + a
Contoh = 7 + 2 = 2 + 7 = 9
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3. Unsur Identitas terhap penjumlahan
Bilangan nol (0) disebut unsur identitas terhadap penjumlahan
a + 0 = 0+ a
contoh : 6 + 0 = 0 +6
4. Unsur Invers terhadap penjumlahan invers jumlah ( lawan) dari a adalah -a
Invers umlah ( lawan) dari -a adalah a
a + (-a) =(-a )+ a
contoh 5 + (-5) + 5 = 0
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5. Bersikap tertutup
Apabila 2 buah bilangan bulat ditambahkan maka hasilnya adlah bilangan bulat juga
a dan b elemen bilangan bulat maka a + b = c ; c elemen bilangan bulat
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