1. 1.5*[(+1)-(+0.2)]/(-3.125)
*係times /係divided
2. (1/3-3/5)(-1 又7/8) divided 1/2
1/3= 3分一
數學題,10分.
2007-09-22 3:19 am
回答 (4)
2007-09-22 3:23 am
✔ 最佳答案
1. 1.5*[(+1)-(+0.2)]/(-3.125)=1.5x0.8/-3.125
=1.2/-3.125
=-0.384
2. (1/3-3/5)(-1 又7/8) divided 1/2
=(5/15-9/15)(-15/8)x2
=(-4/15)(-15/8)x2
=0.5x2
=1
2007-09-22 3:36 am
1. 1.5*[(+1)-(+0.2)]/(-3.125)
=1.5*(1-0.2)/(-3.125)
=1.2/(-3.125)
=(-0.375)
2. (1/3-3/5)(-1 又7/8) divided 1/2
=[(5-9)/15](-15/8)(2)
=1
2007-09-21 19:40:15 補充：
correction:1. 1.5*[( 1)-( 0.2)]/(-3.125)=1.5*(1-0.2)/(-3.125)=1.2/(-3.125)=(-0.384)
=1.5*(1-0.2)/(-3.125)
=1.2/(-3.125)
=(-0.375)
2. (1/3-3/5)(-1 又7/8) divided 1/2
=[(5-9)/15](-15/8)(2)
=1
2007-09-21 19:40:15 補充：
correction:1. 1.5*[( 1)-( 0.2)]/(-3.125)=1.5*(1-0.2)/(-3.125)=1.2/(-3.125)=(-0.384)
參考: me
2007-09-22 3:30 am
1. 1.5x[(+1)-(+0.2)]除(-3.125)
=1.5x0.8除3.125
=0.384
2.(1/3-3/5)(-1 又7/8)除1/2
= (40/120-72/120)(-225/120)x2
=1
=1.5x0.8除3.125
=0.384
2.(1/3-3/5)(-1 又7/8)除1/2
= (40/120-72/120)(-225/120)x2
=1
2007-09-22 3:21 am
1)係x完,再除
收錄日期: 2021-04-13 13:34:31
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070921000051KK02895