解:17×22-34等于( 340 ) ∵已知需求出17×22-34等于多少 A × B - A × D = A × (B - D) ∴17 × 22 - 34 = 17 × 22 - 17 × 2 = 17 × (22 - 2) = 17 × 20 = 340 答:17×22-34等于340
先算乘法17乘22=374再算减法374减34=340