（1）. 6x - 7 - （4x + 5）
（2）. 7x - 6 - 2（3x-1）
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2012-07-30 6:22 pm
回答 (2)
2012-07-30 7:25 pm
✔ 最佳答案
1.6x - 7 - （4x + 5)
=2x-12
2.
7x - 6 - 2（3x-1）
=7x-6-6x+2
=x-4
2012-07-30 6:55 pm
1)
6x - 7 - (4x + 5)
6x - 7 = 4x + 5
6x -4x = 5+7
2x = 12
x = 12/2
x = 6
2)
7x - 6 - 2(3x-1)
7x - 6 = 2(3x-1)
7x - 6 = 6x - 2
7x - 6x = 6 - 2
x = 4
6x - 7 - (4x + 5)
6x - 7 = 4x + 5
6x -4x = 5+7
2x = 12
x = 12/2
x = 6
2)
7x - 6 - 2(3x-1)
7x - 6 = 2(3x-1)
7x - 6 = 6x - 2
7x - 6x = 6 - 2
x = 4
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