0.45乘18怎么简便
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0.5×18=9 0.05×18=0.9 9-0.9=8.1
======以下答案可供参考======
供参考答案1:
0.45×18
=0.45×2×9
=0.9×9
=8.1供参考答案2:
0.45*18=0.45*2*9=0.9*9=8.1
供参考答案3:
(0.4+0.05)*18
=0.4x18+0.05x18
=7.2+0.9
=8.1供参考答案4:
0.45*6*3=2.7*3=8.1
供参考答案5:
把18分成9×2，0.45×2×9=8.1
供参考答案6:
0.45=5*0.09，18=2*9，
而2*5=10……
供参考答案7:
0.45×18
=9/20 ×9×2=81/10=8.1