1.12+2(y-5)+5(4+y)=28+y
2.3/y+2=3/2y
3.父比子大27歲，5年後父是子年4倍，求子年。
幫幫手(數學)
2008-03-19 2:41 am
回答 (3)
2008-03-19 2:47 am
✔ 最佳答案
1. 12 + 2Y -10 + 20 +5Y=28+Y22+7Y = 28 +Y
6Y = 6
Y = 1
2. 3/y+2 = 3/2y
(3 + 2y)/y=3/2y
3 + 2Y = 3/2
2y = 3/2 - 3 = -3/2
y= -3/4
3. Let y be the age of 子.
(y+27)+5=4(5+y)
y + 32 = 20 + 4y
12 = 3y
y=4
2008-03-25 5:34 am
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2008-03-19 3:37 am
1. 12 + 2Y -10 + 20 +5Y=28+Y
注意先乘除後加減~ 2(y-5) <--一組的 可以乘左先
22+7Y = 28 +Y
6Y = 6
Y = 1
2. 3/y+2 = 3/2y
(3 + 2y)/y=3/2y
3 + 2Y = 3/2
2y = 3/2 - 3 = -3/2
y= -3/4
3. 設子為x歲
(x+27)+5=4(5+x)
x+32 = 20 + 4x
12 = 3x
x=4
注意先乘除後加減~ 2(y-5) <--一組的 可以乘左先
22+7Y = 28 +Y
6Y = 6
Y = 1
2. 3/y+2 = 3/2y
(3 + 2y)/y=3/2y
3 + 2Y = 3/2
2y = 3/2 - 3 = -3/2
y= -3/4
3. 設子為x歲
(x+27)+5=4(5+x)
x+32 = 20 + 4x
12 = 3x
x=4
收錄日期: 2021-04-13 15:18:08
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