绵阳药剂师招聘信息:还想问问你,能够算出来吗?

来源:百度文库 编辑:高考快车 时间:2020/02/26 02:02:59
在1234567,12345678,123456789中,只添上减号.能够形成多少个算式(不得负数的)?
请写出具体等式来.谢谢.

1、1234567,12个:
1234-567=667,12345-67=12278,123456-7=123449,123-45-67=11
1234-5-67=1162,1234-56-7=1171,12345-6-7=12332,123-4-5-67=47
123-4-56-7=56,123-45-6-7=65,1234-5-6-7=1216,123-4-5-6-7=101

2、12345678,20个:
12345-678=11667,123456-78=123378,1234567-8=1234559
1234-5-678=551,1234-56-78=1100,1234-567-8=659
12345-6-78=12261,12345-67-8=12270,123456-7-8=123441
123-45-67-8=3,1234-5-6-78=1145,1234-5-67-8=1154
1234-56-7-8=1163,12345-6-7-8=12324,123-4-5-6-78=30
123-4-5-67-8=39,123-4-56-7-8=48,123-45-6-7-8=57
1234-5-6-7-8=1208,123-4-5-6-7-8=93

3、123456789,34个:
12345-6789=5556,123456-789=122667,1234567-89=1234478
12345678-9=12345669,1234-56-789=389,1234-567-89=578
12345-6-789=11550,12345-67-89=12189,12345-678-9=11658
123456-7-89=123360,123456-78-9=123369,1234567-8-9=1234550
1234-5-6-789=434,1234-5-67-89=1073,1234-5-678-9=542
1234-56-7-89=1082,1234-56-78-9=1091,1234-567-8-9=650
12345-6-7-89=12243,12345-6-78-9=12252,12345-67-8-9=12261
123456-7-8-9=123432,1234-5-6-7-89=1127,1234-5-6-78-9=1136
1234-5-67-8-9=1145,1234-56-7-8-9=1154,12345-6-7-8-9=12315
123-4-5-6-7-89=12,123-4-5-6-78-9=21,123-4-5-67-8-9=30
123-4-56-7-8-9=39,123-45-6-7-8-9=48,1234-5-6-7-8-9=1199
123-4-5-6-7-8-9=84