请讲几道奥数题199.7+997.7+977.1-1997.71=7.2*61.3+73.8*2.8=（78.6-0.786*25+0.75*21.4）/15*2001=172.4*6.2+1724*0.38=36*2.54+1.8*49.2=3.6*31.4+68.9*6.4=999+9999+9999*9999+99999/99999

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请讲几道奥数题199.7+997.7+977.1-1997.71=7.2*61.3+73.8*2.8=（78.6-0.786*25+0.75*21.4）/15*2001=172.4*6.2+1724*0.38=36*2.54+1.8*49.2=3.6*31.4+68.9*6.4=999+9999+9999*9999+99999/99999
请讲几道奥数题
199.7+997.7+977.1-1997.71=
7.2*61.3+73.8*2.8=
（78.6-0.786*25+0.75*21.4）/15*2001=
172.4*6.2+1724*0.38=
36*2.54+1.8*49.2=
3.6*31.4+68.9*6.4=
999+9999+9999*9999+99999/99999

请讲几道奥数题199.7+997.7+977.1-1997.71=7.2*61.3+73.8*2.8=（78.6-0.786*25+0.75*21.4）/15*2001=172.4*6.2+1724*0.38=36*2.54+1.8*49.2=3.6*31.4+68.9*6.4=999+9999+9999*9999+99999/99999
1:=176.79
2:=648.
3:=5722.86
4:=172.4
5:=180
6:=554
7:=99981100

199.7+997.7+977.1-1997.71=?如何巧算? 请讲几道奥数题199.7+997.7+977.1-1997.71=7.2*61.3+73.8*2.8=（78.6-0.786*25+0.75*21.4）/15*2001=172.4*6.2+1724*0.38=36*2.54+1.8*49.2=3.6*31.4+68.9*6.4=999+9999+9999*9999+99999/99999 199.7*199.7-19.95*1999的简便方法 199.7+19.97+1.997简便 31*19.97+199.7*6.8+199.7*0.1= 简算急急急 31*19.97+199.7*6.8+199.7*0.1= 简算 脱式计算能简算的要简算 《4/5+1/4》+7/3+7/10 13÷《1/4+5/6》*3/4 31*19.97+199.7*6.8+199.7*0.12-7/18÷7/9-1/2《4/5+1/4》+7/3+7/10这是一道题 200.1*19.99-20.01*199.7-2.001*1.998= 1999*199.8-1998*199.7怎么简便 1997+199.7+19.97+1.997应该怎样解 3.997+19.96+1.9998+199.7(简便运算) 3.997+19.96+1.9998+199.7（简算） 19.99*199.8-199.7*19.99简便计算 199.7+19.7+9.7+0.9的简便算法咋做,快 用简便方法计算：1999*199.8-1998*199.7,求求, 1997+199.7+19.97+1.997+0.1997+0.01997怎么简便计算? 2.4*5.8+0.28*4.2简便算法199.7*19.98-199.9*19.96 1997+199.7+19.97+1.997+0.1997+0.01997怎样简便计算