GMAT數(shù)學(xué)數(shù)據(jù)充分性題的解題技巧
1. GMAT數(shù)據(jù)充分性問(wèn)題的說(shuō)明相當(dāng)復(fù)雜。做真題的時(shí)候，在著手解題之前，花些時(shí)間冷靜的學(xué)習(xí)一下數(shù)據(jù)充分性問(wèn)題的說(shuō)明，是很有必要的。熟讀、理解整個(gè)說(shuō)明，熟記下面這五個(gè)選項(xiàng)，這五個(gè)選項(xiàng)對(duì)于每一道數(shù)據(jù)充分性問(wèn)題都是一樣的?？荚嚂r(shí)，千萬(wàn)不要再花時(shí)間看說(shuō)明了。
A. Statement ALONE is sufficient, but statement alone is not sufficient to answer the question asked;
B. Statement ALONE is sufficient, but statement alone is not sufficient to answer the question asked;
C. BOTH statements and TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient;
D. EACH statement ALONE is sufficient to answer the question asked;
E. Statements and TOGETHER are NOT sufficient to answer the question asked, and additional dataspecific to the problem are needed.
2. 你的目標(biāo)是判定是否有足夠的信息來(lái)回答問(wèn)題，不要花時(shí)間進(jìn)行運(yùn)算。GMAT數(shù)據(jù)充分性問(wèn)題主要是考查數(shù)學(xué)概念，而不是數(shù)字運(yùn)算的能力。如果你發(fā)現(xiàn)自己在進(jìn)行大量的筆頭運(yùn)算，那你一定走錯(cuò)了方向。
3. 和標(biāo)準(zhǔn)多項(xiàng)選擇題中的幾何圖形不同的是，數(shù)據(jù)充分性問(wèn)題的圖形并不一定成比例除非說(shuō)明了圖形是按比例作出的。不要目測(cè)角度大小、線段長(zhǎng)度和面積。要利用數(shù)學(xué)知識(shí)處理題干給出的數(shù)字，來(lái)解決問(wèn)題。
4. 避免常見(jiàn)陷阱。例如方根的正負(fù)性問(wèn)題，樹(shù)值的唯一性問(wèn)題，以及must be與should be, could be這樣的文字游戲。
5. 如果可以排除選項(xiàng)A或選項(xiàng)B中的一項(xiàng)，就可以排除選項(xiàng)D。
例如：Is CAB a code word in language Q?
ABC is the base word.
If C immediately follows B, then C can be moved to the front of the code word to generate another word.
這道例題中，一看第一項(xiàng)就沒(méi)有說(shuō)明生成新詞的規(guī)則，因此A可以排除，D可以排除。剩下的工作就只有結(jié)合兩條說(shuō)明項(xiàng)，檢查選項(xiàng)C的正誤了。
6. 如果兩條說(shuō)明項(xiàng)中的一項(xiàng)就足夠回答題干中的問(wèn)題，就可以排除選項(xiàng)C和E了。
例如：What is the value of x?
3x = 24
4x 36
很明顯，第一條說(shuō)明項(xiàng)就可以回答答題干中的問(wèn)題，C和E就都被排除了。剩下的就看說(shuō)明項(xiàng)能不能確定x的數(shù)值了。
1. GMAT數(shù)據(jù)充分性問(wèn)題的說(shuō)明相當(dāng)復(fù)雜。做真題的時(shí)候，在著手解題之前，花些時(shí)間冷靜的學(xué)習(xí)一下數(shù)據(jù)充分性問(wèn)題的說(shuō)明，是很有必要的。熟讀、理解整個(gè)說(shuō)明，熟記下面這五個(gè)選項(xiàng)，這五個(gè)選項(xiàng)對(duì)于每一道數(shù)據(jù)充分性問(wèn)題都是一樣的?？荚嚂r(shí)，千萬(wàn)不要再花時(shí)間看說(shuō)明了。
A. Statement ALONE is sufficient, but statement alone is not sufficient to answer the question asked;
B. Statement ALONE is sufficient, but statement alone is not sufficient to answer the question asked;
C. BOTH statements and TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient;
D. EACH statement ALONE is sufficient to answer the question asked;
E. Statements and TOGETHER are NOT sufficient to answer the question asked, and additional dataspecific to the problem are needed.
2. 你的目標(biāo)是判定是否有足夠的信息來(lái)回答問(wèn)題，不要花時(shí)間進(jìn)行運(yùn)算。GMAT數(shù)據(jù)充分性問(wèn)題主要是考查數(shù)學(xué)概念，而不是數(shù)字運(yùn)算的能力。如果你發(fā)現(xiàn)自己在進(jìn)行大量的筆頭運(yùn)算，那你一定走錯(cuò)了方向。
3. 和標(biāo)準(zhǔn)多項(xiàng)選擇題中的幾何圖形不同的是，數(shù)據(jù)充分性問(wèn)題的圖形并不一定成比例除非說(shuō)明了圖形是按比例作出的。不要目測(cè)角度大小、線段長(zhǎng)度和面積。要利用數(shù)學(xué)知識(shí)處理題干給出的數(shù)字，來(lái)解決問(wèn)題。
4. 避免常見(jiàn)陷阱。例如方根的正負(fù)性問(wèn)題，樹(shù)值的唯一性問(wèn)題，以及must be與should be, could be這樣的文字游戲。
5. 如果可以排除選項(xiàng)A或選項(xiàng)B中的一項(xiàng)，就可以排除選項(xiàng)D。
例如：Is CAB a code word in language Q?
ABC is the base word.
If C immediately follows B, then C can be moved to the front of the code word to generate another word.
這道例題中，一看第一項(xiàng)就沒(méi)有說(shuō)明生成新詞的規(guī)則，因此A可以排除，D可以排除。剩下的工作就只有結(jié)合兩條說(shuō)明項(xiàng)，檢查選項(xiàng)C的正誤了。
6. 如果兩條說(shuō)明項(xiàng)中的一項(xiàng)就足夠回答題干中的問(wèn)題，就可以排除選項(xiàng)C和E了。
例如：What is the value of x?
3x = 24
4x 36
很明顯，第一條說(shuō)明項(xiàng)就可以回答答題干中的問(wèn)題，C和E就都被排除了。剩下的就看說(shuō)明項(xiàng)能不能確定x的數(shù)值了。
