是一道题还是两道题?
（2.9-2.9x0.9)/(3.7-2.7)
=[2.9×(1-0.9)]/1
＝2.9×0.1
＝0.29
(25+2.5+0.25)x4
＝25×4+2.5×4+0.25×4
＝100+10+1
＝111
（2.9-2.9x0.9)/(3.7-2.7)(25+2.5+0.25)x4
＝0.29×(100+10+1)
=29+2.9+0.29
=31.9+0.29
=32.19