解:7+1万等于( 10007 ) ∵已知需求出7+1万等于几 1 × 10000 = 10000 ∴7 + 1万 = 7 + 10000 = (10 - 3)+ 10000 = 10 - 3 + 10000 = 10 + 10000 - 3 = 10010 - 3 = 10007 答:7+1万等于10007