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
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