如图所示
解:简便计算方法如下 3.8×0.45+0.38×6.5-0.038×10 =3.8×0.45+3.8×0.65-3.8×0.1 =3.8×(0.45+0.65-0.1)=3.8×1 =3.8
5.4×0.38+0.56×3.8-0.038×10=5.4×0.38+0.56×3.8-0.38=0.38*(5.4+5.6-1)=0.38*10=3.8
正确答案是:3.8×(0.54+0.56-0.1)=3.8×1=3.8