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1 8 7 9算24点

1*(9+8+7)=24; 1*9+8+7=24; 1*8+9+7=24; 1*7+9+8=24; 满意请采纳

1. [﹙7+8﹚÷1]+9 2. [9+﹙8+7﹚]×1 3. [﹙9+7﹚×1]+8

(9+8)÷1+7=24 9+8+7÷1=24 (9+8+7)×1=24 (9+8+7)÷1=24 9×1+8+7=24 (9+1-7)×8=24 1×(9+8)+7=24

((1*7) 8) 9 1*((7 8) 9) (1*(7 8)) 9 1*(7 (8 9)) (1*7) (8 9) (1-(7-9))*8 ((1-7) 9)*8 ((1*7) 9) 8 1*((7 9) 8) (1*(7 9)) 8 1*(7 (9 8)) (1*7) (9 8) ((1*8) 7) 9 1*((8 7) 9) (1*(8 7)) 9 1*(8 (7 9)) (1*8) (7 9) ((1*8) 9) 7 1*((8 9) 7)...

根号7+1+1 ×8

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...

((4+7)-8)*8 (4+(7-8))*8 4*(7-(8/8)) ((4+7)-8)*8 (4+(7-8))*8 4*(7-(8/8)) (4-(8-7))*8 ((4-8)+7)*8 (4-(8-7))*8 ((4-8)+7)*8 ((7+4)-8)*8 (7+(4-8))*8 ((7+4)-8)*8 (7+(4-8))*8 (7-(8-4))*8 ((7-8)+4)*8 (7*8)-(4*8) (7-(8/8))*4 (7*8)-(8*4)...

((10+8)+7)-1 10+((8+7)-1) (10+(8+7))-1 10+(8+(7-1)) (10+8)+(7-1) 10+(8-(1-7)) (10+8)-(1-7) ((10+8)-1)+7 10+((8-1)+7) (10+(8-1))+7 ((10-7)*8)/1 (10-7)*(8/1) ((10-7)*8)*1 (10-7)*(8*1) ((10+7)+8)-1 10+((7+8)-1) (10+(7+8))-1 10+(7+...

8-7=1,9-1=8,3×8=24

1,7,8,3算24点,解法如下: 8*(7-(3+1)) 3/(1-(7/8)) (7-(3+1))*8

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