199.7+997.1+977.1-1997.71=?如何巧算?
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199.7+997.1+977.1-1997.71=?如何巧算?
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
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