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Matematika SMP Kelas VII
2 + 4 + 6 + ... + 98 + 100 =
2 + 100 = 102
4 + 98 = 102
6 + 96 = 102
8 + 94 = 102
10 + 92 = 102
------------------------- +
510
12 sampai 90 = 510
22 sampai 80 = 510
32 sampai 70 = 510
42 sampai 60 = 510
5 x 510 = 2.550