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3.2x1.8+2.54
=3.2x(2.0-0.2)+2.54
=3.2x2.0-3.2x0.2+2.54
=6.4-0.64+2.54
=6.4+(2.54-0.64)
=6.4+1.9
=8.3
=3.2x(2.0-0.2)+2.54
=3.2x2.0-3.2x0.2+2.54
=6.4-0.64+2.54
=6.4+(2.54-0.64)
=6.4+1.9
=8.3
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