37 × (1 / 80 + 1 / 43) - 43 × (1 / 37 - 1 / 80) + 80 × (1 / 37 - 1 / 43) 간편 계산

37 × (1 / 80 + 1 / 43) - 43 × (1 / 37 - 1 / 80) + 80 × (1 / 37 - 1 / 43) 간편 계산

= 37 / 80 + 37 / 43 - 43 / 37 + 43 / 80 + 80 / 37 - 80 / 43
= (37 / 80 + 47 / 80) + (37 / 43 - 80 / 43) + (- 43 / 37 + 80 / 37)
= 1 + (- 1) + 1
= 1