说起演绎推理最具特征的可能就是must be true和main point两种题型，这样提及大家或许更为熟悉，下面小编就通过两道例题为大家稍作讲解。
一、GMAT逻辑演绎推理简介
1、GMAT逻辑演绎推理的定义。
所谓演绎推理，就是从一般性的前提出发，通过推导即“演绎”，得出具体陈述或个别结论的过程。关于演绎推理，还存在以下定义：演绎推理是从一般到特殊的推理;它是前提蕴涵结论的推理;它是前提和结论之间具有必然联系的推理;演绎推理就是前提与结论之间具有充分条件或充分必要条件联系的必然性推理。
2、GMAT逻辑演绎推理的特征。
1)题型特点：这种题目，不是评估类题目。看懂原文就会做。可以根据问题来直接判断种类。
2)抽象形式：must be true or main point…
(详情请看 GMAT逻辑演绎推理解题法 )
二、GMAT逻辑演绎推理的解题方法
1、GMAT逻辑演绎推理的题型。
1)must be true题答案一定来自于原文，是原文某句话的改写或逆否命题，或某几句话的结合，特别是原文有充分必要推理的。特别注意数量和可能性的词的差别。
2)Main point题原文主结论的重写，必须概括全文并且是must be true。
2、解题方向：
1)must be true: 迷惑性选项有可能为真，但不一定为真;扩大范围;包含新信息;偷换概念等。
2)Main point：迷惑性选项有答案为真，但未包括作者结论，或者答案是原文前提的改写或重复。
(详情请看 GMAT逻辑七大推理模式详解 )
三、GMAT逻辑演绎推理举例分析
例一：
Kale has more nutritional value than spinach. But since collard greens have more nutritional value than lettuce, it follows that kale has more nutritional value than lettuce.
Any of the following, if introduced into the argument as an additional premise, makes the argument above logically correct EXCEPT:
(A) Collard greens have more nutritional value than kale.
(B) Spinach has more nutritional value than lettuce.
(C) Spinach has more nutritional value than collard greens.
(D) Spinach and collard greens have the same nutritional value.
(E) Kale and collard greens have the same nutritional value.
演绎推理分析：
K > s ,cg>l,问的是哪个选项加进来不可以使 k>l。
A 正确。cg>k, cg> l , k和l不能比。
B s>l , k>s>l
C s>cg, k>s>cg>l
D s=cg, k>s=cg>l
E k=cg, k=cg>l
例二：
Which of the following best completes the passage below?
When the products of several competing suppliers are perceived by consumers to be essentially the same, classical economics predicts that price competition will reduce prices to the same minimal levels and all suppliers’ profits to the same minimal levels. Therefore, if classical economics is true, and given suppliers’ desire to make as much profit as possible, it should be expected that ____ .
(A) in a crowded market widely differing prices will be charged for products that are essentially the same as each other
(B) as a market becomes less crowded as suppliers leave, the profits of the remaining suppliers will tend to decrease
(C) each supplier in a crowded market will try to convince consumers that its product differs significantly from its competitors’ products.
(D) when consumers are unable to distinguish the products in a crowded market, consumers will judge that the higher-priced products are of higher quality
(E) suppliers in crowded markets will have more incentive to reduce prices and thus increase sales than to introduce innovations that would distinguish their product from their competitors’ products
演绎推理分析：
推测可能的结果，演绎类。
A 不符合观点，价格应该趋同且趋于最小。
B 供货商减少，还在的供货商应该顾客会更多。
C 正确。为了不让利益最小化，供货商会宣传自己的商品不一样。
D 不能分辨说明品质趋同，顾客应该选的是价格低的那个。
E 降价不一定能以多销达到最大收益。
(详情请看 GMAT逻辑练习题)
GMAT逻辑推理模式的最后一种百利天下小编就为大家介绍这些，到此GMAT逻辑推理模式系列就为大家讲解完了，赶紧拿起题目练习巩固吧。
您还可能关注：
