12.35*1.06-200.8*0.6简便计算

问题描述:

12.35*1.06-200.8*0.6简便计算

12.35*1.06-200.8*0.6=12.35*(1+0.06)-(200+0.8)*0.6=12.35+12.35*0.06-200*0.6-0.8*0.6=12.35-200*0.6+12.35*0.06-8*0.06=12.35-120+(12.35-8)*0.06=12.35-120+4.35*0.06=12.35-120+0.261=-107.389啊啊啊啊啊,对不起,打错题目了12.35+5/7-(2.35-2/7)这个才是12.35+5/7-(2.35-2/7)=12.35+5/7-2.35+2/7=12.35-2.35+5/7+2/7=(12.35-2.35)+(5/7+2/7)=10+1=11多谢