123456789 987654321
123456780 087654321
123456700 007654321
123456000 000654321
123450000 000054321
123400000 000004321
123000000 000000321
120000000 000000021
100000000 000000001
_________ _________
_________ _________
上面為各行數(shù)字順序都正好相反的兩個(gè)加法式,看起來顯然有些類似之處,你認(rèn)為哪一個(gè)的和較大?