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= (123)(1)
= 123
512² - 510² = (512 + 510)(512 - 510)
= (1022)(2)
= 2044
21² - 18² = (21 + 18)(21 - 18)
= (39)(3)
= 117
⇒ ( 62 + 61 ) ( 62 - 61 )
⇒ 123 × 1
⇒ 123
⇔ 512² - 510²
⇒ ( 512 + 510 ) ( 512 - 510 )
⇒ 1.022 × 2
⇒ 2.044
⇔ 21² - 18²
⇒ ( 21 + 18 ) ( 21 - 18 )
⇒ 39 × 3
⇒ 117