0.21*0.100是等于0.021还是等于0.02啊
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0.21*0.100是等于0.021还是等于0.02啊0.21*0.100是等于0.021还是等于0.02啊0.21*0.100是等于0.021还是等于0.02啊0.0210.21有两位有效数字,0.
0.21*0.100是等于0.021还是等于0.02啊
0.21*0.100是等于0.021还是等于0.02啊
0.21*0.100是等于0.021还是等于0.02啊
0.021
0.21有两位有效数字,0.100有三位有效数字,因而相乘应保留2位有效数字,0.021