3.56×9.9+0.356 或 3.56×9.9+0.356
=0.356×10×9.9+0.356 =3.56×9.9+3.56×0.1
=0.356×(10×9.9+1) =3.56×(9.9+0.1)
=0.356×(99+1) =3.56×10
=0.356×100 =35.6
=35.6