好難做的奧數題目,Help me(3)

1. 1x1x1x1x1
=1

2. 11-1-1-1
=10-1-1
=9-1
=8

3. (5/5+5/5)x5
=(1+1)x5
=2x5
=10

4.(9+9)/9+9+9
=18/9+9+9
=2+9+9
=11+9
=20

1.1+ (1- 1)-( 1- 1)=1
2.11- 1- 1- 1=8
3.5x5-( 5+ 5+ 5)=10
4.9+9+ (9+9)/ 9=20

1. 1+1-1+1-1 = 1

2. 11-1-1-1 = 8

3. 5x5-5-5-5 = 10


4. ( 9+9 ) / 9+9+9 = 20 or __9+9__ = 20
............................................9+9+9

1. 1 * 1 * 1 * 1 * 1 = 1

3. 5 * 5 - 5 - 5 - 5 = 10
4. 9 + 9 + [ ( 9 + 9 ) / 9 ] = 20

2006-12-29 11:11:39 補充：
2. 11 - ( 1 + 1 + 1 ) = 8

1.1+1-1+1-1=1
2.(11)-1-1-1=8
3.5*5-5-5-5=10
4.(9+9)/9+9+9=20

1. 1+1-1+1-1=1

2. 11-1-1-1=8

3. 5x5-5-5-5=10

4. (9+9)/9+9+9=20

第一同第五題，第一樓的哥仔都答到你啦。
第二題要比d時間我，sorry
第四題呢係(9+9)/9+(9+9) =20

1.1-1+1-1+1=1
2.(1 1)-1-1-1=8
3.5x5-5+5-5=10

1+1-1*1/1=1

1+ 1- 1+ 1- 1=1

2006-12-29 10:57:56 補充：
(9 9 )/ 9 9 9 =20 5 * 5 - 5- 5 - 5=10