(1+0.23+0.33)*(0.23+0.33+0.43)-(1+0.23+0.33+0.43)*(0.23+0.33)如何简便计算

显示全部楼层 · 2012-9-12 15:38:01

(1+0.23+0.33)*(0.23+0.33+0.43)-(1+0.23+0.33+0.43)*(0.23+0.33)=(1+0.23+0.33)*(0.23+0.33+0.43)-(1+0.23+0.33)*(0.23+0.33)-0.43*(0.23+0.33)=(1+0.23+0.33)*[(0.23+0.33+0.43)-(0.23+0.33)]-0.43*(0.23+0.33)=(1+0.23+0.33)*0.43-0.43*(0.23+0.33)=0.43*[(1+0.23+0.33)-(0.23+0.33)]=0.43*1=0.43...

千问 · 2012-9-12 15:38:01

把1+0.23+0.33 和 0.23+0.33 看做一个整体，假设分别为a、b那题目可以如下解：a*b+a*0.43-a*b-0.43*b=0.43（a-b）=0.43*1=0.43...

千问 · 2012-9-12 15:38:01

(1+0.23+0.33)*(0.23+0.33+0.43)-(1+0.23+0.33+0.43)*(0.23+0.33)=(0.23+0.33+0.43)+(0.23+0.33)*(0.23+0.33+0.43)-(0.23+033)-(0.23+0.33+0.43)*(0.23+0.33)=(0.23+0.33+0.43)-(0.23+033)...