数字排列问题!1234567890组成四位数字0可以在首位排列出所有组合能列出...答:0869,0871,0872,0873,0874,0875,0876,0879,0891,0892,0893,0894,0895,0896,0897,0912,0913,0914,0915,0916,0917,0918,0921,0923,0924,0925,0926,0927,0928,0931,0932,0934,0935,0936,0937,0938,0941,0942,0943,0945,0946,0947,0948,0951,0952,0953,0954,0956,0957,0958,0961,0962,0963,0964,0965,0967,...