Question

4.25*5.24+1.52*2.51=?808*0.125-1600除以16=?都要简便.

Answer 1

1 4.25*5.24+1.52*2.51

=(4+0.25)*(5+0.25-0.01)+(1+0.5+0.02)*(2+0.5+0.01)

=(4*5+4*0.25-4*0.01)+(0.25*5+0.25*0.25- 0.25*0.01)+(2+0.5+0.01+0.5*2+0.5*0.5+0.5*0.01+0.02*2+0.02*0.5+0.02*0.01)

=20.96+1.31+2.51+1.3052

=26.0852

2 808*0.125-1600/16

=(800+8)*1/8-100

=800*1/8+8*1/8-100

=100-100+1

=1