數學一問*___*

1.2又5分1乘5分4乘1又2分1
= 2 1/5 * 4/5 * 1 ½
= 11/5 * 4/5 * 3/2
= (11 * 4 * 3) / (5 * 5 * 2)
=132 / 50
=66/25
=2 16/25
=2又25分16

2.6又4分3除8分3
= (6 ¾ ) / (3/8)
= (27/4) * 8/3
= 216 / 12
= 18

3.(38又10分3-18又2分1)+50又20分之17
= (38 3/10 - 18 ½) + 50 17/20
=19 8/10 + 50 17/20
=70 13/20
=70又20分13

4.(328除8分5)-(328除4分1)
=(328 / (5/8) - (328 / (1/4)
= (328 * 8/5) - (328 * 4)
=524 4/5 - 1312
= - 787 1/5
=- 787 又5分1

5.2又3分2除1又9分7
=(2 2/3) / (1 7/9)
=(8/3) * (9/16)
=72/48
=1 ½
= 1又2分1

6.3又4分1-1又12分5+2又8分3
= 3 ¼ - 1 5/12 + 2 3/8
= 13/4 - 17/12 + 19/8
= 78/24 - 34/24 + 57/24
= 101 / 24
= 4 5/24
= 4又24分5

希望可以幫到你.

2007-08-28 15:08:28 補充：
幫到你嗎?