解：3.58×9.9+0.058 =3×9.9+0.58×9.9+0.58×0.1 =3×10-3×0.1+0.58×（9.9+0.1） =30-0.3+5.8 =35.5（望采纳，谢谢）
3.58×9.9+0.058=3.58×（10-0.1)+0.058=35.8-0.358+0.058=35.8-0.3=35.5
