2005*(3.4*6.9+3.5)/3.5*6.9-3.4分数简便运算,

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2005*(3.4*6.9+3.5)/3.5*6.9-3.4分数简便运算,
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2005*(3.4*6.9+3.5)/3.5*6.9-3.4分数简便运算,
2005*(3.4*6.9+3.5)/3.5*6.9-3.4
分数简便运算,

2005*(3.4*6.9+3.5)/3.5*6.9-3.4分数简便运算,
原式=2005*[3.4*(34+35)+3.5]/[3.5*(34+35)-3.4]
=2005*（3.4*34+3.4*35+3.5)/(3.5*34+3.5*35-3.4)
=2005*[3.4*34+3.5(3.4*10+1)]/[3.5*35+3.4*(3.5*10-1)]
=2005*(3.4*34+3.5*35)/(3.5*35+3.4*34)
=2005