用简便方法计算下面各题 ①20230 ②20235 ③239 ④2023 ⑤2023511 ⑥2023911 ⑦2023 ⑧202354 ⑨202320232023 ⑩2023125 (11)202325 答 案:①20230=2023 ②20235=2023 ③239=230-23=207 ④2023=2023-23=2023 ⑤2023511=202395 ⑥2023911=202379⑦2023=(36+18)10=540 ⑧202354=123(254)=20230⑨202320232023 =456(25)(254)(2023) =202320230 ⑩2023125 =(254)(2023) =202300 (11)202325 =2023025 =364 =144 |