66大顺的题目,难于登天?分别在6个相同数字组成的6位数--111111,222222,333333,444444,555555,666666,777777,888888,999999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.
66大顺的题目,难于登天?
分别在6个相同数字组成的6位数--111111,222222,333333,444444,555555,666666,777777,888888,999999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.
每种分别8个：
111-111=0,1111-11=1100,11111-1=11110,111-1-11=99,111-11-1=99,1111-1-1=1109
111-1-1-1=108,11-1-1-1-1=7
222-222=0,2222-22=2200,22222-2=22220,222-2-22=198,222-22-2=198,2222-2-2=2218
222-2-2-2=216,22-2-2-2-2=14
333-333=0,3333-33=3300,33333-3=33330,333-3-33=297,333-33-3=297,3333-3-3=3327
333-3-3-3=324,33-3-3-3-3=21
444-444=0,4444-44=4400,44444-4=44440,444-4-44=396,444-44-4=396,4444-4-4=4436
444-4-4-4=432,44-4-4-4-4=28
555-555=0,5555-55=5500,55555-5=55550,555-5-55=495,555-55-5=495,5555-5-5=5545
555-5-5-5=540,55-5-5-5-5=35
666-666=0,6666-66=6600,66666-6=66660,666-6-66=594,666-66-6=594,6666-6-6=6654
666-6-6-6=648,66-6-6-6-6=42
777-777=0,7777-77=7700,77777-7=77770,777-7-77=693,777-77-7=693,7777-7-7=7763
777-7-7-7=756,77-7-7-7-7=49
888-888=0,8888-88=8800,88888-8=88880,888-8-88=792,888-88-8=792,8888-8-8=8872
888-8-8-8=864,88-8-8-8-8=56
999-999=0,9999-99=9900,99999-9=99990,999-9-99=891,999-99-9=891,9999-9-9=9981
999-9-9-9=972,99-9-9-9-9=63