十位数字有0时,百位上有2,3,4,5,6,7,8,9这8个数可选,个位数字有0,2,3,4,5,6,7,8,9这9个数可选,共8×9=72个
个位数字有0时,百位上有2,3,4,5,6,7,8,9这8个数可选,十位数字有0,2,3,4,5,6,7,8,9这9个数可选,共8×9=72个
去掉重复的8个数(十位、个位都有0),
总计72×2-8=136个
十位数字有0时,百位上有2,3,4,5,6,7,8,9这8个数可选,个位数字有0,2,3,4,5,6,7,8,9这9个数可选,共8×9=72个
个位数字有0时,百位上有2,3,4,5,6,7,8,9这8个数可选,十位数字有0,2,3,4,5,6,7,8,9这9个数可选,共8×9=72个
去掉重复的8个数(十位、个位都有0),
总计72×2-8=136个