解:1+1等于( 2 ) ∵已知需求出1加1等于几 1个1 = 1 * 1 = 1 2个1相加 = 1 + 1 = 2 * 1 = 2 ∴1加1等于 = 2个1相加 = 2 答:1+1等于2
数学中l+l=z