我不懂得.........

4 8/5 - 1 1/14 * 4 1/15 = ?
先 * / 後 + -
1 1/14 = 15/14
4 1/15 = 61/15
61*15/14*15 = 915/210
4 8/5 = 28/5
28/5 - 915/210

42*28/210 - 915/210= 261/210

4又5分之八減1又14分之1乘4又15分之1
=28 / 5 - 15 / 14 x 61 / 15
= 28 / 5 - 61 / 14
=87 / 70
約=1.24

4 8/5 -1 1/14 X 4 1/15
=28/5 - 15/14 X 61/15
=28/5 - 915/210
=1176/210 - 915/210
=261/210
=87/70
=1 17/70

4又5分之八減1又14分之1乘4又15分之1= ?

4又5分之八減1又14分之1乘4又15分之1

=28/5 - 15/14 x 61/15

=28/5 - 61/14

=87/70

? = 87/70

4又5分之八減1又14分之1乘4又15分之1
= 4 8/5 – 1 1/14 * 4 1/15
= 4 8/5 – 15/14 * 61/15
= 4 8/5 – 61/14
= 28/5 – 61/14
= 392/70 – 305/70
= 87/70
= 1 17/70

2007-02-03 20:31:56 補充：
計錯數！
1 1/14 * 4 1/15 = 61/14
不是915/210
計錯數！

1又70分之17