解:56×17+63×17+17等于( 2040 ) ∵已知需求出56×17+63×17+17等于多少 X × Y + X × Z = X × (Y + Z) ∴56 × 17 + 63 × 17 + 17 = 17 × ( 56 + 63 + 1) = 17 × (119 + 1) = 17 × 120 = 2040 答:56×17+63×17+17等于2040
有你个鬼名堂!