2.25×1.8＋1.25×0.18
=2.25*0.18*10+1.25*0.18
=0.18*(2.25*10+1.25)
=0.18*23.75
=4.275
解：2.25*1.8+1.25*0.18
=2.25x1.8+0.125x1.8
=2.25x（1+0.8）+0.125x（1+0.8）
=2.25x1+2.25x0.8+0.125x1+0.125x0.8
=2.25+1.8+0.125+0.1
=4.05+0.225
=4.275
=(2.25+0.125)x1.8
=(4.5+0.25)x0.9
=40275
计算机！
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