F.4 INEQUALITIES 1條

Question: 2x－7 ＜ (6x－1)/3
=3(2x－7) ＜ 6x－1
=6x － 21 ＜ 6x－1
=6x－6x－21 ＜ -1
= -21＜ -1 (Answer)

However, I , think there should be an error on the question itself because the final solution should contain a "X". Check for it.

2011-01-25 12:05:57 補充：
To make conclusion: Besides of calculation, we should add one more sentence after it:
"X can be any real numbers", isn't it?

-21＜ -1 (or 7 > 1/3) is NOT the Answer of this question.

Because the question required us to solve for X.

Since 2x - 7 < 2x - 1/3 is always true ,

so the answer is :

X can be any value.

2011-01-25 12:22:30 補充：
Of course X cann't be complex number.

2011-01-25 12:29:10 補充：
In the strict sense , X can be any real number.

The answer of ☂雨後陽光☀ is correct.

The solution consists of all real numbers.

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