一條方程 連步驟 20point

2007-01-06 7:01 am
25% - 15%y = 8

回答 (16)

2007-01-06 7:05 am
✔ 最佳答案
25% - 15%y = 8
10%y = 8
y = 80
參考: myself
2007-01-11 9:48 am
25/100-15y/100=8
1/4=8+3y/20
-7/3/4=3y/20
y= -51/2/3
2007-01-06 5:57 pm
25%-15%y=8
0.25-0.15y=8
-0.15y=7.75
y=51.66666666666.........
y=51.67

2007-01-06 09:58:36 補充:
Sorry,y應該=-51.67
參考: ME~
2007-01-06 3:08 pm
25% - 15%y = 8
0.25-0.15y=8
-0.15y=7.75
y=-51.67
2007-01-06 8:11 am
25% - 15%y = 8

25/100 - 15y/100 = 8 (初中要求通常是用百份比)
(25-15y) / 100 = 8 (當份母相同就可以作份子相減)
25-15y = 8 x 100 (先移動份母到右方以簡化問題)
-15y = 800-25 (再移動整數到右方以簡化問題)
-15y = 775 (再次移動整數到右方以簡化問題)
- y = 775/15
- y = 155 / 3 (因為是找y,不是 -y,所以亦要將負數移動到右方,記住啦,
數學運算 " - " 是等如"-1",以後計算有用)
y = 155 / 3 (如題目講明不可用計算機,這就可以算做ans,如要求為
"準確至小數點後x位",咁就要用計數機計多次la)

其實不論exam或homework都會有差唔多的問題,記住step,慢慢自己試多幾次,
唔太難,不過每次移動時要小心,好多時扣分都係扣careless 多過計錯steps!

Bless you!
2007-01-06 7:36 am
0.25-0.15y=8
0.25-8=0.15y
-7.75=0.15y
-7.75/0.15=y
-51.66666667....=y
2007-01-06 7:12 am
25% - 15%y = 8
0.25-0.15y=8
0.15y=-7.75
y=-155/3
2007-01-06 7:11 am
(25/100)-(15/100)y=8
0.25-0.15y=8
-0.15y=8-0.25
y=(8-0.25)/-0.15
y=51.66666667
2007-01-06 7:10 am
25% - 15%y = 8
-15% y =8-25%
-15%y =775%
y =775/100 / (-15%)
y=775/100*(-100/15)
y= -51/2/3
=========
參考: me
2007-01-06 7:08 am
25%-15%y=8
0.25-0.15y=8
  0.25+8=0.15y
   8.25=1.5y
  825/15=y
    y=55

2007-01-05 23:14:23 補充:
sory,計錯:8.25=1.5y82.5/15=yy=5.5由尾3行開始
參考: 自己
2007-01-06 7:05 am
25% - 15%y = 8
0.25-0.15y=8
-0.15y=7.75
y=-51.67
參考: ME


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