2022年新GRE数学易错题范例解析

2022年新GRE数学易错题范例解析1thesumoftwonumbers,xandy,equalstwicetheirproducts.ifx=3,whatisthevalueofy?

这道题没大看懂?请问大家是这样么?x+y=2(x+y)

x+y=2xy,求y.

2ifxisanintegerandx2(x的平方)90度，比拟三角形的周长与3倍AC的长度的大小，答案是B

AC是边,所以AB+BC+AC

2.0

比拟thegreatestvalueofp(1-p)与1/2的大小，答案是C

答案错了,选Bp+(1-p)>=2p(1-p)^1/2=>p(1-p)<=1/4<1/2

4forthelinewithequationy=ax+b,thex-interceptostwicethey-intercept

比拟theslopeoftheline与1/2的大小，答案是D，但算出来是-1/2呀

还有截距为零的状况,所以D.

5acertainmoneymarketaccountthathadabalanceof$48000duringalloflastmonthearned$360ininterestforthemonth.atwhatsimpleannualinterestratedidtheaccountearninterestlastmonth?

答案是9%,题目没看懂

意思是一个货币市场上个月共结余48000，用它赚了360的利息，问以年单利计算每年利率是多少?

360*12/48000=9%

6Ofthepositiveintegersthataremultiplesof30andarelessthanorequalto360,whatfractionaremultiplesof12?

a.1/6b.1/5c.1/3d.2/5e.1/2

首先这道题我是对multilplesof....不大明白,这是什么意思啊?其次这道题怎么解呢?

在小于360的30的公倍数中,也是12的公倍数的占多少?30N≤360,得N≤12,所以共有12个数满意题干.

又12与30的最小公倍数为60,其实此题是求是60的倍数又小于等于360所占比例,同理求出为6

所以,6/12=答案E

7Acertainteacherhasatotalofatleast110studentsenrolledinherclasses.iftheteachershasanaverage(arithmeticmean)ofexactly27studentsenrolledperclass.whatistheleastpossiblenumberofclassesthattheteachercouldhave?

a.3b.4c.5d.6e.7

我觉得这道题就是用110除以27就好了,可是答案是选c的

是呀，110/27=4.04,假如是4个班，那么总人数为108，还剩2个。固然是5个班了。

8adeliveryservicecharges$0.02perounceforthefirst16ouncesofashipmentand$0.15foreachadditionalounceoftheshipment,(1pound=16ounce)

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