0.65×47+6.5×5.3
=0.65×47+0.65×53
=0.65×(47+53)
=0.65×100
=65=0.65×47+0.65×53这一步可以直接写吗？是怎么来的可以，0.65×47+6.5×5.3 =0.65×47+0.65×10×5.3 =0.65×47+0.65×(10×5.3) =0.65×47+0.65×53