(1) 21 (2)题里头貌似少个7吧
(1) (-1)+(+2)+(-3)+(+4)+.+(-41)+(+42) (2)1+2-3-4+5+6-8+9+…+1
5个回答
相关问题
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1 1/2-2 5/6+3 1/12-4 19/20-5 1/30+6 41/42-7 1/56+8 71/72-9 1
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7 1 5 4 3 19 3 6 8 6 3 2 6 9 81 8 41 6 9 9 2 4 4 8 2
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1.1,1,2,2,3,4,3,5,()A.7 B.6 C.5 D.42.1,8,9,4,(),1/6A.3 B.2 C
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1.1,1,2,2,3,4,3,5,()A.7 B.6 C.5 D.42.1,8,9,4,(),1/6A.3 B.2 C
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1+1/2-2--+5/6+3+1/12-4+19/20-5+1/30+6+41/42-7-1/5
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1 2 6 3 4 5=40 ,1 3 4 2 5 6=41 ,1 4 2 5 6 3=32 ,1 5 3 6 4 2=
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1+1+2+3+4+5+6-7-8-9..........-100-42+5000
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计算-{-【-(-5)】} -{+【-(+5)】}(-1)+(+2)+(-3)+(+4)+...+(-41)+(+42)
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1*1/2-2*5/6+3*1/12-4*19/20+5*1/30-6*41/42+7*1/56-
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(-1)+(+2)+(-3)+(+4)+.+(-41)+(+42)