GMAT數(shù)學(xué)備考資料:練習(xí)+講解(20)
下面GMAT思為大家整理了GMAT數(shù)學(xué)備考資料:練習(xí)+講解(20),供考生們參考,以下是詳細(xì)內(nèi)容。
1、y=x^2+2qx+r,X軸上有幾個(gè)交點(diǎn)?
q^2
r^2
【答案】A
【思路】AX^2+BX+C=0這個(gè)方程, IF B^2-4AC0,方程有兩個(gè)不相等的實(shí)根;IF B^2-4AC=0,方程有兩個(gè)相等的實(shí)根;IF B^2-4AC0,方程無解。
2、一個(gè)班有18個(gè)男生,全班有26人選修生物課,問全班人數(shù)?
男生中選修生物課的有15人;
女生人數(shù)是沒有選修生物課的人數(shù)的2倍;
【答案】B
【思路】設(shè)全班人數(shù)為X,則女生人數(shù)為X-18,沒選修的人數(shù)為X-26,只有條件二可解X。
3、There are 100 students in the class. Each student must choose at least one course of English, French, and German. But no student can choose all the three class. There are 30 students learn E, and 60 students learn French, and 15 students learning German also learn English. How many students learn German?
【答案】25
【思路】100-30-60+15=25,學(xué)E不學(xué)F,也就是E與F的交集為0,同理F與G的交集也為0,那么只有E與G有交集為15,則學(xué)E學(xué)G的人為60+30-15,現(xiàn)在要求F只要把學(xué)E學(xué)G的減掉即可。
4、Every internal angle in a polygon is less than 180. How much is the average internal angle for a polygon:
there are two right internal angles;
there are five vertices;
【答案】B
【思路】五個(gè)頂點(diǎn)就表示有五個(gè)角,那么這個(gè)圖形就是無邊形,內(nèi)角和為180=3180=540,其平均數(shù)為540/5=108。而條件一無法確定到底有幾個(gè)角。
5、There are two set A and B which only includes positive integer. A and B have the same number of positive integers. Is the median of A greater than the average of B?
the items in A are even, the items in B is odd;
the sum of A is equal to sum of B;
【答案】E
【思路】舉反例:A{-2,2} B{-1,1} OR A{2,4,6,8} B{1,3,5,11}
以上就是GMAT數(shù)學(xué)備考資料:練習(xí)+講解(20)的詳細(xì)內(nèi)容,考生可針對(duì)文中介紹的方法進(jìn)行有針對(duì)性的備考。最后,GMAT預(yù)祝大家在GMAT考試中取得好成績!
下面GMAT思為大家整理了GMAT數(shù)學(xué)備考資料:練習(xí)+講解(20),供考生們參考,以下是詳細(xì)內(nèi)容。
1、y=x^2+2qx+r,X軸上有幾個(gè)交點(diǎn)?
q^2
r^2
【答案】A
【思路】AX^2+BX+C=0這個(gè)方程, IF B^2-4AC0,方程有兩個(gè)不相等的實(shí)根;IF B^2-4AC=0,方程有兩個(gè)相等的實(shí)根;IF B^2-4AC0,方程無解。
2、一個(gè)班有18個(gè)男生,全班有26人選修生物課,問全班人數(shù)?
男生中選修生物課的有15人;
女生人數(shù)是沒有選修生物課的人數(shù)的2倍;
【答案】B
【思路】設(shè)全班人數(shù)為X,則女生人數(shù)為X-18,沒選修的人數(shù)為X-26,只有條件二可解X。
3、There are 100 students in the class. Each student must choose at least one course of English, French, and German. But no student can choose all the three class. There are 30 students learn E, and 60 students learn French, and 15 students learning German also learn English. How many students learn German?
【答案】25
【思路】100-30-60+15=25,學(xué)E不學(xué)F,也就是E與F的交集為0,同理F與G的交集也為0,那么只有E與G有交集為15,則學(xué)E學(xué)G的人為60+30-15,現(xiàn)在要求F只要把學(xué)E學(xué)G的減掉即可。
4、Every internal angle in a polygon is less than 180. How much is the average internal angle for a polygon:
there are two right internal angles;
there are five vertices;
【答案】B
【思路】五個(gè)頂點(diǎn)就表示有五個(gè)角,那么這個(gè)圖形就是無邊形,內(nèi)角和為180=3180=540,其平均數(shù)為540/5=108。而條件一無法確定到底有幾個(gè)角。
5、There are two set A and B which only includes positive integer. A and B have the same number of positive integers. Is the median of A greater than the average of B?
the items in A are even, the items in B is odd;
the sum of A is equal to sum of B;
【答案】E
【思路】舉反例:A{-2,2} B{-1,1} OR A{2,4,6,8} B{1,3,5,11}
以上就是GMAT數(shù)學(xué)備考資料:練習(xí)+講解(20)的詳細(xì)內(nèi)容,考生可針對(duì)文中介紹的方法進(jìn)行有針對(duì)性的備考。最后,GMAT預(yù)祝大家在GMAT考試中取得好成績!