Tom had 6 books. He gave 2 to his sister and then purchased 3 more books at the bookstore. Which of the following mathematical e

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问题 Tom had 6 books. He gave 2 to his sister and then purchased 3 more books at the bookstore. Which of the following mathematical expressions is equivalent to the number of books that Tom now has?

选项 A、6-2 + 3
B、6 + 2-3
C、6(2 + 3)
D、6(2 - 3)

答案6-2 + 3

解析 You are given that Tom started out with 6 books. After he gave 2 books to his sister he was left with 6-2 books. He then purchased 3 more books, so he now has 6-2 + 3 books.

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Tom had 6 books. He gave 2 to his sister and then purchased 3 more books at the bookstore. Which of the following mathematical e

GRE QUANTITATIVE

GRE

Ialwaysencouragesuchpeople,butIalsoexplainthatthere’sabigdifferencebetween"beingawriter"andwriting.

AsIwasgrowingup,mylifewentaroundsoccer(足球).Iplayedonthenationalyouthsoccerteams,andtravelledtoEurope.Atag

Howdoyouknowifyourhomeisaneasyaimforthefts?Aroundtheholidays,manyfamiliesdon’tconsidertakingpropermeasures

Personswhoareoverweightshouldwatchtheirdietcarefullyinordertolosepounds.Thebestwaytodothisistostartaweig

Thereatthedoorstoodagirlaboutthesameheight______.

A、 B、 C、 D、 E、 B16+64canberewrittenas16(1+4);thesquarerootof(16×5)is.

Thesizeofaflat-screentelevisionisgivenasthelengthofthescreen’sdiagonal.Howmanysquareinchesgreateristhescre

Ifcubicalblocksinadisplayarestackedoneontopoftheotheronaflatsurface,whatisthevolumeofthestackofblocks

Acircularrim28inchesindiameterrotatesthesamenumberofinchespersecondasacircularrim35inchesindiameter．Ifthe

BInthisquestion,youareaskedtocomparetheareaoftrianglePQRwiththeareaoftrianglePSR.Notethatbothtrianglesare

脱水干燥储存是一种食品的化学储存方法。()

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如果一个完全放射标记的双链DNA分子，放在不含有放射标记物的溶液中，进行两轮复制，所产生的DNA分子的放射活性将会怎样()。

在牙周膜的修复中起重要作用的是

A、一类医疗器械B、二类医疗器械C、三类医疗器械D、试产品E、准产品由省、自治区、直辖市人民政府药品监督管理部门批准并发给产品注册证书的是

1，2，3，4，7，6，()

设A、B、A+B、A—1+B—1均为n阶可逆方阵，则(A—1+B—1)—1=

设，则级数

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