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问题 填空题

已知a+b=10，ab=-2，则（3a+b）-（2a-ab）=______．

答案

∵a+b=10，ab=-2，

∴（3a+b）-（2a-ab）

=3a+b-2a+ab

=a+b+ab

=10-2

=8．

故答案为：8．

单项选择题

在施工平行发包模式中，业主将不同的施工任务分别委托给不同的施工单位，各个施工单位分别与业主签订合同，各个施工单位之间的关系是( )。

A．上下关系

B．领导关系

C．平行关系

D．无影响
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单项选择题

Now that you’ve gotten a little more confident, we’re going to give you the opportunity to practice "without the training wheels." When you want to check your work, you can turn to the solutions at the end. If you aren’t familiar with some of the mathematical concepts, make a note to pay particular attention to that chapter in this book; this practice set covers a wide range of topics tested on the GMAT.
On all data sufficiency problems, the answer choices are the same (as you’ve learned). We’ve put them here for your reference.
Ａ. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Ｂ. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
Ｃ. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
Ｄ. EACH statement ALONE is sufficient.
Ｅ. Statements (1) and (2) TOGETHER are NOT sufficient.

Over a holiday weekend, a certain car dealer sold off 4 of the cars on its lot. If the cars sold for an average of $6,000 each, how many cars were on the dealer’s lot at the beginning of the weekend
(1) The average value of the remaining cars on the lot is $5,000.
(2) The car dealer made $48,000 in car sales over the weekend.
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