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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

5乘以(9-4)-1=24

1×3×5+9=24

1: (1 + 2) × (9 - 1) 2: (2 + 1) × (9 - 1) 3: (9 - 1) × (1 + 2) 4: (9 - 1) × (2 + 1)

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

7+((9*2)-1) (7+(9*2))-1 7+((2*9)-1) (7+(2*9))-1 ((7*2)+9)+1 (7*2)+(9+1) ((7*2)+1)+9 (7*2)+(1+9) 7-(1-(9*2)) (7-1)+(9*2) 7-(1-(2*9)) (7-1)+(2*9) 9+((7*2)+1) (9+(7*2))+1 9+((2*7)+1) (9+(2*7))+1 ((9*2)+7)-1 (9*2)+(7-1) (9*2)-(1-7)...

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

2*8-1+9=24; 2*(9-1)+8=24; 8/(1+2)*9=24; 8-(1-9)*2=24;

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

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

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