0.65✘6.4-0.65✘5.4
=0.65×（6.4-5.4）.................乘法的分配律
=0.65×1
=0.65
0.65＊6.4-0.65＊5.4=0.65＊(6.4-5.4)=0.65
等于0.65×（6.4-5.4）=0.65×1=0.65所以结果等于0.65
0.65×6.4-0.65×5.4=0.65×(6.4-5.4)=0.65×1=0.65
