小数计算 奥数高分啦

1 3.14*70.1-0.314+314*0.3
=0.314*10*70.1-0.314+0.314*1000*0.3
=0.314*701-0.314*+0.314*300
=0.314*(701-1+300)
=0.314*1000
=314

2 1.25*67.875+125*0.7875+1250*0.053375
=1.25*67.875+1.25*100*0.7875+1.25*1000*0.053375
=1.25*67.875+1.25*78.75+1.25*53.375
=1.25*(67.875+78.75+53.375)
=1.25*200
=250

3 0.125*2.5*64*0.5
=0.125*2.5*(8*4*2)*0.5
=(0.125*8)*(2.5*4)*(2*0.5)
=1*10*1
=10

4 6.25*8.72*16+3.75*0.827*8
这个错了
应该是
6.25*0.872*16+3.75*8.72*8
=6.25*0.872*(8*2)+3.75*0.872*10*8
=(6.25*2)*0.872*8+(3.75*10)*0.872*8
=12.5*0.872*8+37.5*0.872*8
=(12.5+37.5)*0.872*8
=50*8*0.872
=400*0.872
=348.8

1) 3.14*70.1-0.314+314*0.3
= 3.14*70.1-3.14*0.1+3.14*100*0.3=3.14*(70.1-0.1+30)=3.14*100=314

2) 1.25*67.875+125*0.7875+1250*0.053375
= 1.25*67.875+1.25*100*0.7875+1.25*1000*0.053375
= 1.25*(67.875+78.75+53.375)=1.25*200