7-7( 1 supra 6 ori 1 supra 7) 6 supra 41

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✎ ( 7 - 7 × 1/6 × 1/7 ) × 6/41 = ?
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( 7 - 7 × 1/6 × 1/7 ) × 6/41 =
( ⁶/ 7 - 1/6 ) × 6/41 =
( 42/6 - 1/6 ) × 6/41 =
41/6 × 6/41 = ( 41 × 6 )/( 6 × 41 ) = 1