0.45*18怎么简便
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0.45*18怎么简便
0.45*18怎么简便
0.45*18怎么简便
=0.45*2*9
=0.9*9
=8.1
0.45*18
=0.45*20-0.45*2
=9-0.9=8.1
0.45*18怎么简便
0.45*18怎么简便
0.45*18怎么简便
=0.45*2*9
=0.9*9
=8.1
0.45*18
=0.45*20-0.45*2
=9-0.9=8.1