0.86+9.9x8.6=8.6x0.1+9.9x8.6=8.6x(0.1+9.9)=8.6x10=86
0.86+9.9x8.6简便计算0.86+9.9x8.6=0.86+99×0.86=0.86×(1+99)=0.86×100=86
0.86+9.9x8.6简便计算=8.6×(0.1+9.9)=8.6×10=86
=8.6×0.1+9.9×8.6=8.6×(0.1+9.9)=8.6×10=86
=0.86*(1+99)=0.86*100=86