0.45×1.8如何简便计算

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0.45×1.8如何简便计算0.45×1.8如何简便计算0.45×1.8如何简便计算0.45×1.8=0.45×2×0.9=0.9×0.9=0.810.45*1.8=(0.45*2)*(1.8/2)=

0.45×1.8如何简便计算
0.45×1.8如何简便计算

0.45×1.8如何简便计算
0.45×1.8
=0.45×2×0.9
=0.9×0.9
=0.81

0.45*1.8=(0.45*2)*(1.8/2)=0.9*0.9=9*9/100=81/100=0.81

0.45*2*0.9=0.81