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= 100² - 2² ⇒inget konsep a² - b² = (a - b)(a + b)
= 10.000 - 4
= 9996
c. 205² = 42.025 ⇒ kalikan 20 dgn bilangan sesudahnya, lalu pada ujungnya letakkan angka 25 (20 × 21 = 420)
6. a . 37² + 74 + 1 = (37)² + 2(37)(1) + (1)²
= (37 + 1)² = 38²