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Mathemathic Trick
RIZKI AGNESTRIA (110210204036)
• 18² - 15² = ? 18 + 15 = 33 18 - 15 = 3
• Jadi = 33x3 = 99
• Mengurangi dari 1.000
1000 - 648 = ?Tahap 1: kurangi 6 dari 9 = 3Tahap 2: kurangi 4 dari 9 = 5Tahap 3: kurangi 8 dari 10 = 2
• Jawaban: 352
• Bilangan 987654321 dikali sembilan bilangan asli kelipatan 9 yang pertama :
• 987654321 x 9 = 8.888.888.889• 987654321 x 18 = 17.777.777.778• 987654321 x 27 = 26.666.666.667• 987654321 x 36 = 35.555.555.556• 987654321 x 45 = 44.444.444.445• 987654321 x 54 = 53.333.333.334• 987654321 x 63 = 62.222.222.223• 987654321 x 72 = 71.111.111.112• 987654321 x 81 = 80.000.000.001
Mathemathic Black Hole