我要全個步驟:
[(4x-6)+(1/2x)2]=30
thx~
未字數..數學一題
2007-10-28 2:18 am
回答 (4)
2007-10-28 2:44 am
✔ 最佳答案
[(4x-6)+(1/2x)2]=304x-6+x=30
5x-6=30
5x=36
x=7.2or36/5
(4*7.2)+(1/2*7.2)=30
28.8+1.2=30
Answer is correct
參考: Me
2007-10-28 3:25 am
[(4x-6)+(1/2x)2] = 30 {-----> (1/2x)2 = 1x = x}
(4x-6)+x = 30
4x-6 +x = 30
5x-6 = 30
5x = 36
x = 7.2
Checking: substitute x = 7.2
[(4x-6)+(1/2x)2]
[ ( 4 x 7.2 - 6 ) + ( 1/2 x 7.2 ) 2 ]
= [ ( 28.8 - 6 ) + ( 3.6 ) 2 ]
= [ ( 22.8) + (7.2) ]
= 30
** correct
(4x-6)+x = 30
4x-6 +x = 30
5x-6 = 30
5x = 36
x = 7.2
Checking: substitute x = 7.2
[(4x-6)+(1/2x)2]
[ ( 4 x 7.2 - 6 ) + ( 1/2 x 7.2 ) 2 ]
= [ ( 28.8 - 6 ) + ( 3.6 ) 2 ]
= [ ( 22.8) + (7.2) ]
= 30
** correct
2007-10-28 2:27 am
[(4x-6)+(1/2x)2]=30
(4x-6)+x=30
5x=36
x = 7.2
(4x-6)+x=30
5x=36
x = 7.2
收錄日期: 2021-04-20 21:53:32
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https://hk.answers.yahoo.com/question/index?qid=20071027000051KK03596