偶数即个位是偶数：2.4.83×（3×4）=3×12=36种:个位数是2：142,152,182,412,452,482,512,542,582,812,842,852个位数是4：124,154,184,214,254,284,514,524,584,814,824,854个位数是8： 128,148,158,218,248,258,418,428,458,518,528,548,所以，一共36个
