TAILIEUCHUNG - The gre anlytycal writting section 6

Tham khảo tài liệu 'the gre anlytycal writting section 6', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | -------------------------- THE GRE QUANTITATIVE SECTION ----------------------------------- To simplify a square root radical write the radicand as the product of two factors with one number being the largest perfect square factor. Then write the radical of each factor and simplify. Example 8 V4 X V2 2V2 Ratio The ratio of the numbers 10 to 30 can be expressed in several ways for example 10 to 30 or 10 30 or qo 30 Since a ratio is also an implied division it can be reduced to lowest terms. Therefore since both 10 and 30 are multiples of 10 the above ratio can be written as 1 to 3 or 1 3 or 1 3 Algebra Review Congratulations on completing the arithmetic section. Fortunately you will only need to know a small portion of algebra normally taught in a high school algebra course for the GRE. The following section outlines only the essential concepts and skills you will need for success on the GRE Quantitative section. Equations An equation is solved by finding a number that is equal to a certain variable. Simple Rules for Working with Equations 1. The equal sign seperates an equation into two sides. 2. Whenever an operation is performed on one side the same operation must be performed on the other side. 3. Your first goal is to get all the variables on one side and all the numbers on the other. 4. The final step often is to divide each side by the coefficient leaving the variable equal to a number. 165 THE GRE QUANTITATIVE SECTION Example of solving an equation 3x 5 20 -5 -5 3x 15 3x _ 15 3 3 x 5 Cross Multiplying You can solve an equation that sets one fraction equal to another by cross multiplication. Cross multiplication involves setting the products of opposite pairs of numerators and denominators equal. Example x x I210 becomes 12x x 6 10 12x 6x 60 12x - 6x 6x - 6x 60 6x 60 6x 60 6 6 x 10 Checking Solutions To check a solution substitute the number equal to the variable in the original equation. Example To check the equation from the previous example substitute the

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