8.9x0.9+0.89=0.89×9+0.89=0.89×(9+1)=0.89×10=8.9
=8.9x0.9+8.9x0.1=8.9X(0.9+0.1)=8.9X1=8.9
=8.9✘(0.9+0.1)=8.9✘1=8.9
0.89*9+0.89=0.89*10=8.9望采纳
原式=8.9x(0.9+0.1)=8.9x1=8.9
0.89x(9+1)