奥数专题之速算与巧算3
1.37+56+63+442.284+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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