1.28*8.6+0.72*0.86

12.8×0.86+0.72×8.6简算12.8×0.86+0.72×8.6=1.28×8.6+0.72×8.6=(1.28+0.72)X8.6=2X8.6=17.2

1.28*8.6+0.72*8.6的简便方法=8.6*(1.28+0.72)=8.6*2=17.2

1.28*86+0.72*8.6的简便计算原式=12.8*8.6+0.72*8.6=(12.8+0.72)*8.6你题是不是抄错了而且都不给分

0.25*8.5*42.4*1.021.28*8.6+0.72*8.612.5*0.96*0.8用简便方法计算.急用0.25*8.5*4=0.25*4*8.5=1*8.5=8.52.4*1.02=2.4*1+2.4*0.02=2.4+0.0

2.4×8.6+7.5×8.6+0.86简便运算2.4*0.86+7.5*8.6+8.6*0.1=8.6*（2.4+7.5+0.1）=8.6*10=86

0.86+8.6*9.9简便计算0.86+8.6*9.9=8.6*0.1+8.6*9.9=8.6*(0.1+9.9)=8.6*10=86

递等式1.3*8.6+8.6*8.6+0.86怎么巧算,=1.3*8.6+8.6*8.6+8.6*0.1=8.6（1.3+8.6+0.1）=8.6*10=86把0.86看成是8.6*0.1这样等式的三个部分里都有8.6了提出8.6，等式变成

4.78-1.28+1.22-0.72的简便算法4.78+1.22-（1.28+0.72）

0.86＋8.6×9.9的简算0.86＋8.6×9.9=8.6x0.1+8.6x9.9=8.6x(0.1+9.9)=8.6x10=86

简算8.6*5.4+0.86+86*0.458.6*5.4+0.86*+86*0.45=8.6*5.4+8.6*0.1+8.6*4.5=8.6*(5.4+0.1+4.5)=8.6*10=86

0.86*15.7-8.6*1.47的简算8.6*（1.57-1.47）=0.86

8.6*1.57-0.86*14.7如何简便8.6*1.57-0.86*14.7=8.6×（1.57-1.47）=8.6×0.1=0.86

1.28×8.6—0.28×8.6等于多少,要简便运算, 

8.6×5.6+0.86+86×0.43的简便运算是什么?8.6×5.6+0.86+86×0.43的简便运算是什么,要简便的化成86x0.56+86x0.01+86x0.43=86x(0.56+0.01+0.43)=86提取公因式

4.78－1.28＋1.22－0.72怎么简便计算4.78+1.22-（1.28+0.72）=6-2=4（4.78+1.22）-（1.28+0.72）

8.6×5.4＋0.86＋86×0.45的简便方法8.6×5.4＋0.86＋86×0.45=8.6x5.4+8.6x0.1+8.6x4.5=8.6x（5.4+0.1+4.5）=8.6x10=86有不明白的可以追问!谢谢!祝学习进步

2.4乘8.6加7.5乘8.6加0.86简便计算 

8.6*2.7+62*14%+35*0.86121+27+121*60+121*16+79*91+12*798.6*2.7+62*14%+35*0.86121+27+121*60+121*16+79*91+12*79要简算8.6*2.7+6

8.6*2.7+62*14%+35*0.86121+27+121*60+121*16+79*91+12*798.6*2.7+62*14%+35*0.86=0.86*27+35*0.86+62*14%=0.86*(27+35)+62*0.14

用简便方法计算0.28×8.6+7.2×0.86999×778+333×666怎样写?0.28×8.6+7.2×0.86=0.28*8.6+0.72*8.6=(0.28+0.72)*8.6=1*8.6=8.6999×778+333×666=