奥数专题之速算与巧算3来源:网络 2009-05-06 15:21:32 [标签:奥数]奥数精华资讯 免费订阅
1.37+56+63+44 2.284+178 3.89+91+90+92+88+87+93+92+87 4.4996+3993+2992+1991+98 5.1800-90-176-10-24 6.125?13?4?8?25?5?2 7.1999+999?999 8.321?654?987?654?987?321 9.9999?2222+3333?3334 10.1-2+3-4+5-6+…+1991-1992+1993 11.947+(372-447)-572 12.987-178-222-390 13.325+46-125+54 14.567+558+562+555+563 15.100+99-98+97-96+…+3-2+1 16.(123456+234561+345612+456123+561234+612345)÷6 17.1994×19931993-1992×19941994 18.计算:1+2-3-4+5+6-7-8+9+10-…+1994 19.计算:4726342+4726352-472633×472635- 472634×472636 |
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