maths---中一方程式(15點)

2008-08-15 10:05 pm

緊急!!(要步驟)
solve the following equations:

1)3x + 27=4x +6

2)5x - 4=17- 2x

回答 (4)

2008-08-15 10:44 pm

✔ 最佳答案

1)3x + 27=4x +6
3x+27-3x=4x+6-6
27-6=4x-3x
21=1x
x=21
2)5x - 4=17- 2x
5x-4+2x=17
7x-4=17
7x=21
x=3

參考: me

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2008-08-16 12:36 am

1)
3x + 27=4x +6
27-6=4x-3x
x=21

2)
5x - 4=17- 2x
5x+2x=17+4
7x=21
x=21/7
x=3

參考: me

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2008-08-15 10:09 pm

1)3x + 27=4x +6
3x+27-6=4x
3x+21=4x
21=4x-3x
21=x

2)5x - 4=17- 2x
5x-4+2x=17
7x-4=17
7x=21
x=3

參考: ME`

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2008-08-15 10:07 pm

1. 3x + 27 = 4x +6
27 = 4x - 3x +6
27 - 6 = x
x = 21

2. 5x - 4 = 17 - 2x
5x - 2x - 4= 17
3x = 17+4
3x = 21
x = 7

參考: 自己

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