7.25*1.8+27.5*0.18(简便)

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7.25*1.8+27.5*0.18(简便)
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7.25*1.8+27.5*0.18(简便)
7.25*1.8+27.5*0.18(简便)

7.25*1.8+27.5*0.18(简便)
7.25*1.8+2.75*1.8
=(7.25+2.75)*1.8
=18

=72.5*0.18*27.5*0.18
=(72.5+27.5)*0.18
=100*0.18
=18

7.25*1.8+27.5*0.18
=7.25x18+2.75x1.8
=1.8x(7.25+2.75)
=1.8x10
=18