用2468这四个数字添上小数点组成没有重复数字的小数这样的小数一共有多少个?
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2.468,2.486,2.648,2.684,2.846,2.864,24.68,24.86,26.48,26.84,28.46,28.64,246.8,264.8,248.6,284.6,268.4,286.4以2打头的有18种,一共有18×4=72种
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2020-04-21
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一共有:
2.468,24.68,246.8,
2.486,24.86,248.6,
2.648,26.48,264.8,
2.684,26.84,268.4,
2.864,28.64,286.4,
2.846,28.46,284.6,
4.268,42.68,426.8,
4.286,42.86,428.6,
4.628,46.28,462.8,
4.682,46.82,468.2,
4.862,48.62,486.2,
4.826,48.26,482.6,
6.248,62.48,624.8,
6.284,62.84,628.4,
6.428,64.28,642.8,
6.482,64.82,648.2,
6.842,68.42,684.2,
6.824,68.24,682.4,
8.246,82.46,824.6
8.264,82.64,826.4,
8.426,84.62,842.6,
8.462,84.62,842.6,
8.624,86.24,862.4,
8.642,86.42,864.2
2.468,24.68,246.8,
2.486,24.86,248.6,
2.648,26.48,264.8,
2.684,26.84,268.4,
2.864,28.64,286.4,
2.846,28.46,284.6,
4.268,42.68,426.8,
4.286,42.86,428.6,
4.628,46.28,462.8,
4.682,46.82,468.2,
4.862,48.62,486.2,
4.826,48.26,482.6,
6.248,62.48,624.8,
6.284,62.84,628.4,
6.428,64.28,642.8,
6.482,64.82,648.2,
6.842,68.42,684.2,
6.824,68.24,682.4,
8.246,82.46,824.6
8.264,82.64,826.4,
8.426,84.62,842.6,
8.462,84.62,842.6,
8.624,86.24,862.4,
8.642,86.42,864.2
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