(-50)+(-49)+(-48)+...+88+89+90=
Matematika
Gsm925
Pertanyaan
(-50)+(-49)+(-48)+...+88+89+90=
1 Jawaban
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1. Jawaban Anonyme
Bab Pola Bilangan
Matematika SMP Kelas VII
(-50) + (-49) + (-48) + .... + 88 + 89 + 90 = ?
(-50) + 50 = 0
(-49) + 49 = 0
(-48) + 48 = 0
.
.
(-1) + 1 = 0
yang tersisa
51 + 52 + 53 + .... 88 + 89 + 90 = ?
51 + 90 = 141
52 + 89 = 141
53 + 88 = 141
54 + 87 = 141
55 + 86 = 141
56 + 85 = 141
57 + 84 = 141
58 + 83 = 141
59 + 82 = 141
60 + 81 = 141
------- +
1.410
61 sampai 70 = 1.410
jumlah seluruh = 1.410 + 1.410
= 2.820