用0,1,2,3,4,这5个数字和小数点可以组成多少个三位小数?请把他们写出来。
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4放十位有24个。
43.012,43.021,43.102,43.120,43.201,43.210
42.013,42.031,42.103,42.130,42.301,42.310
41.023,41.032,41.203,41.230,41.302,41.320
40.123,40.132,40.213,40.231,40.312,40.321
注意写数时按一定规律写。
同理可写出十位是3,2,1的各24个。所以共有24×4=96个三位小数。
43.012,43.021,43.102,43.120,43.201,43.210
42.013,42.031,42.103,42.130,42.301,42.310
41.023,41.032,41.203,41.230,41.302,41.320
40.123,40.132,40.213,40.231,40.312,40.321
注意写数时按一定规律写。
同理可写出十位是3,2,1的各24个。所以共有24×4=96个三位小数。
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