解:9和8相加和是( 17 ) ∵已知需求出9和8相加和是多少 A + B = C ∴9 + 8 = (10 - 1)+ (10 - 2) = 10 - 1 + 10 - 2 = (10 + 10)+ (- 1 - 2) = 20 - 3 = 17 答:9和8相加和是17
9和8相加;(在十进制的情况下)和是17;(在16进制的情况下)和是11;9+8=17
9+8=17