1.原式=33.33*(6666+3334）=33.33*10000=333300
2.原式=9999*（9999+1）=99990000
3.原式=0.99*（9.9*10+1）=0.99*100=99
4.原式=283*7*0.001+283*7*0.05+7*7*0.001+283*7=7*(0.283+0.007+14.15+283)=7*298.44=2089.08
5.原式=（12+3/4)*3/4+87.25*3/4=100*3/4=75
6.原式=32*15+63*15-5*15=90*15=1350
7.原式=(139+1)*137/138=138*137/138+2*137/138=137+137/69=138又68/69
8.原式=1/2*3+1/3*4+1/4*5+1/5*6+1/6*7=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7=1/2-
1/7=5/14
9.原式=2*1/2*(1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11)=1/3-1/11=8/33
10.原式=1/3*(1/4-1/7+1/7-1/10+1/10-1/13+1/13-1/16)=1/3*3/16=1/16
11.原式=2004/(2004*2006/2005)=1/(2006/2005)=2005/2006
12.原式=99*1/2*2/3*…*98/99 =1
打得我累死了.