可以用1,2,9,2,写一个等于24的算式吗
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用1,2,2,9算24点,共有24种算法。
[2+﹙9+1﹚]×2
[﹙9+1﹚+2]×2
2×[﹙9+2﹚+1]
2×[﹙2+1﹚+9]
[﹙1+9﹚+2]×2
2×[9+﹙2+1﹚]
2×[﹙9+1﹚+2]
2×[1+﹙9+2﹚]
2×[2+﹙1+9﹚]
2×[2+﹙9+1﹚]
2×[﹙1+9﹚+2]
2×[﹙2+9﹚+1]
2×[1+﹙2+9﹚]
[﹙9+2﹚+1]×2
[2+﹙1+9﹚]×2
[﹙1+2﹚+9]×2
2×[﹙1+2﹚+9]
[﹙2+1﹚+9]×2
[﹙2+9﹚+1]×2
[1+﹙9+2﹚]×2
[1+﹙2+9﹚]×2
[9+﹙2+1﹚]×2
[9+﹙1+2﹚]×2
2×[9+﹙1+2﹚]
[2+﹙9+1﹚]×2
[﹙9+1﹚+2]×2
2×[﹙9+2﹚+1]
2×[﹙2+1﹚+9]
[﹙1+9﹚+2]×2
2×[9+﹙2+1﹚]
2×[﹙9+1﹚+2]
2×[1+﹙9+2﹚]
2×[2+﹙1+9﹚]
2×[2+﹙9+1﹚]
2×[﹙1+9﹚+2]
2×[﹙2+9﹚+1]
2×[1+﹙2+9﹚]
[﹙9+2﹚+1]×2
[2+﹙1+9﹚]×2
[﹙1+2﹚+9]×2
2×[﹙1+2﹚+9]
[﹙2+1﹚+9]×2
[﹙2+9﹚+1]×2
[1+﹙9+2﹚]×2
[1+﹙2+9﹚]×2
[9+﹙2+1﹚]×2
[9+﹙1+2﹚]×2
2×[9+﹙1+2﹚]
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