小学四年级每日一题
在下面的算式中添上+,-,,,(),[ ] ,{}等符号,使它们的得数都等于1.
1 2 3 = 1
1 2 3 4 = 1
1 2 3 4 5 = 1
1 2 3 4 5 6 = 1
1 2 3 4 5 6 7 = 1
1 2 3 4 5 6 7 8 = 1
1 2 3 4 5 6 7 8 9 = 1
分析与解
(1 )(1 +2 )3 =1
(2 )1 2 +3 -4 =1
(3 )[(1 +2 )3 +4 ]5 =1
(4 )1 2 3 -4 +5 -6 =1
(5 ){[(1 +2 )3 +4 ]}5 +6 }7 =1
(6 )(1 2 3 -4 +5 -6 +7 )8 =1
(7 )(1 2 +3 +4 -5 +6 +7 -8 )9 =1
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