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1,2,5,9算24点

二乘九等于十八,十八加五再加一等于24

1. [2+﹙9+1﹚]×2 2. [﹙9+1﹚+2]×2 3. 2×[﹙9+2﹚+1]

(9-4)x5-1=24

(1+5)*(13-9)=24

四则运算此题无解,如果可用根号则有8种解。举例如下: 10×2+根号9+1=24

5乘以(9-4)-1=24

1. ﹙10×2﹚+﹙5-1﹚ 2. [﹙10×2﹚+5]-1 3. ﹙5-1﹚+﹙2×10﹚

1: 1 - 2 + 5 × 5 2: (1 - 2) + 5 × 5 3: 1 - 2 +(5 × 5) 4: (1 - 2) + (5 × 5) 5: 1 - (2 - 5 × 5) 6: 1 - (2 - (5 × 5)) 7: 1 + 5 × 5 - 2 8: (1 + 5 × 5) - 2 9: (1 + (5 × 5)) - 2 10: 1 + (5 × 5) - 2 11: 1 + (5 × 5 - 2) 12: 1 + ((5 × 5...

四则运算范围内有3种算法—— (5-2)×1×8 = 3×8 = 24 (5-1)×(8-2) = 4×6 = 24 (8/2)×(5+1) = 4×6 = 24 加上乘方开根又有3种算法—— (2^5-8)×1 = 32-8 = 24 (5^2)-(1^8) = 25-1 = 24 [√(8×2)]×(5+1) = 4×6 = 24 添上阶乘对数再有2种算法—— [log2(8)]!...

可以是: (9-1-2)×4=24 (9+4-1)×2=24 (1+9)×2+4=24

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