2) 3分之y + 4分之y = 8分之7
y=______
3) 10 = 6分之5a+55
a=______
小六方程式2題
2008-02-13 4:17 am
回答 (7)
2008-02-13 4:23 am
✔ 最佳答案
y/3 + y/4 = 7/8(y/3 + y/4 )x 24 = 7x24/8
8y+6y=21
14y=21
y=3/2//
10 = 5a/6+55
2=a/6+11
12=a+66
66-12=-a
a=-54//
2008-02-13 4:36 am
2) 3分之y + 4分之y = 8分之7
y/3+y/4=7/8
4y/12+3y/12=7/8
7y/12=7/8
7y=7/8×12
7y=21/2 (或10.5)
y=21/2÷7 (或10.5÷7)
答案:
以假分數表示:y=3/2
以帶分數表示:y=1又2分之1
以點數表示:y=1.5
3) 10 = 6分之5a+55
10=5a/6+55
10-55=5a/6
-45=5a/6
-45×6=5a
-270=5a
-270÷5=a
答案:
a=-54
y/3+y/4=7/8
4y/12+3y/12=7/8
7y/12=7/8
7y=7/8×12
7y=21/2 (或10.5)
y=21/2÷7 (或10.5÷7)
答案:
以假分數表示:y=3/2
以帶分數表示:y=1又2分之1
以點數表示:y=1.5
3) 10 = 6分之5a+55
10=5a/6+55
10-55=5a/6
-45=5a/6
-45×6=5a
-270=5a
-270÷5=a
答案:
a=-54
參考: 答案已經驗算，確保正確
2008-02-13 4:35 am
y/3 + y/4 = 7/8
(y/3 + y/4 )x 24 = 7x24/8
8y+6y=21
14y=21
y=3/2//
10 = 5a/6+55
2=a/6+11
12=a+66
66-12=-a
a=-54//
(y/3 + y/4 )x 24 = 7x24/8
8y+6y=21
14y=21
y=3/2//
10 = 5a/6+55
2=a/6+11
12=a+66
66-12=-a
a=-54//
2008-02-13 4:31 am
2) y/3 +y/4 = 7/8
通分.. ( 3 和 4 的L.C.M 是12)
4y/12+ 3y/12 = 7/8
7y/12 = 7/8
7y = 7/8 x 12
7y = 21/2
y = 21/2 ÷ 7
y = 3/2 or 1.5
3) 10 = (5a+55)/6
10x 6 = (5a+55)/6 x 6
60 = 5a +55
5a = 60-55
5a = 5
a = 5/5
a =1
2008-02-12 20:34:07 補充：
question no.2 除了通分, 也可將兩邊乘12 or 24.
通分.. ( 3 和 4 的L.C.M 是12)
4y/12+ 3y/12 = 7/8
7y/12 = 7/8
7y = 7/8 x 12
7y = 21/2
y = 21/2 ÷ 7
y = 3/2 or 1.5
3) 10 = (5a+55)/6
10x 6 = (5a+55)/6 x 6
60 = 5a +55
5a = 60-55
5a = 5
a = 5/5
a =1
2008-02-12 20:34:07 補充：
question no.2 除了通分, 也可將兩邊乘12 or 24.
2008-02-13 4:29 am
2)1又２分之1 3) a=負54
2008-02-13 4:23 am
y=3/2
a=1
a=1
2008-02-13 4:20 am
3) 10 = 6分之5a+55
a=1
a=1
收錄日期: 2021-04-13 19:28:05
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080212000051KK03804