0.32×4.5+20.8÷3.2的简便计算过程：
0.32×4.5+20.8÷3.2
=0.32×4.5+20.8÷3.2
=(0.30+0.02)×4.5+20.8÷(1.6x2)
=0.3x4.5+0.02x4.5+20.8÷1.6÷2
=1.35+0.009+13÷2
=1.35+0.009+6.5
=7.859
0.32×4.5十20.8÷3.2
=0.16×9十5.2÷0.8
=1.44十1.3÷0.2
=1.44十13÷2
=1.44十6.6
=8.04
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