解:36-9等于( 27 ) ∵已知需求出36-9等于几 A - B = C ∴36 - 9 = (40 - 4)- (10 - 1) = 40 - 4 - 10 + 1 = (40 - 10)+ (-4 + 1) = 30 - 3 = 27 答:36-9等于27