0.58*3.4+0.58*5.6+0.58简便计算=0.58x（3.4+5.6+1）=0.58x10=5.8
0.58*3.4+0.58*5.6+0.58＝0.58*（3.4+5.6+1）＝0.58*10＝5.8
看
0.58*3.4+0.58*5.6+0.58=0.58*3.4+0.58*5.6+0.58*1=0.58*（3.4+5.6+1）
