| 用简便方法计算. 129+33+(27+41) 125×24×3×8 48×125 299×45. |
| ①129+33+(27+41) =(129+41)+(33+27) =170+60 =230; ②125×24×3×8 =(8×125)×(24×3) =1000×72 =72000; ③48×125 =(125×8)×6 =1000×6 =6000; ④299×45 =(300-1)×45 =300×45-45×1 =13500-45 =13455. |
关注公众号回复:奥数答案
即可免费获得密码查看答案
