=(0.1+0.9)X(9÷2)
=1X4.5
=4.5或
=(0.1+0.9)+(0.2+0.8)+(O.3+0.7)+(0.4+0.6)+0.5=1+1+1+1+0.5
=4.5
0.1+0.2+0.3+0.4+0.5+0.6+0.7+0.8+0.9简便计算
0.1+0.2+0.3+0.4+0.5+0.6+0.7+0.8+0.9简便计算
数学人气:657 ℃时间:2020-04-18 12:57:18
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