=29.7×10+29.7×44.5+29.7×45.5
=29.7×(10+44.5+45.5)
=29.7×100
=2970����һ����297+29.7��44.5+29.7��45.5��һ�����������ʲô���?�����һ�°����ɴ��ˣ�