兩、三位數(shù)的加法和減法(19)
7781788166769622528245859553739340507090
兩、三位數(shù)的加法和減法(20)
9090010010008080090900140140010010001101100110110010010001501500
兩、三位數(shù)的加法和減法(21)
989490087958668100074899379130086982009496 50094
兩、三位數(shù)的加法和減法(22)
514121 281886747178141113818572756263212
兩、三位數(shù)的加法和減法(23)
9090070700606001001000 505004040080800909009090090900
兩、三位數(shù)的加法和減法(24)
11165890062281970036267000880038195028321468
兩、三位數(shù)的加法和減法(25)
963720933641723758375972985086333046 |