41.2×3.6＋16×1又4分之1＋53.7×6.4
＝41.2×(10-6.4)+16+4+53.7×6.4
=412+20+53.7×6.4-41.2×6.4
=432+(53.7-41.2)×6.4
=432+(10+2.5)×6.4
=432+64+10/4×0.64
=496+16
=512