0.654+10.9*6.5=0.1*(6.5+0.04)+10.9*6.5=(10.9+0.1)*6.5+0.004=(10+1)*6.5+0.004=65+6.5+0.004=71.504,这是简便运算的。
0.654+10.9*6.5=0.004+0.65+109*0.65=0.004+(1+109)*0.65=0.004+110*0.65=0.004+65*(1+0.1)=0.004+65+6.5=71.504