小伙伴们，GMAT考试大家复习的怎么样了呢？下面是帮考网分享的一些GMAT考试数学部分的相关资料，一起来看看吧！

数学计算常用公式：

(a+b)(a-b)=a²-b²  (a+b)²=a²+2ab+b²   (a-b)²=a²-2ab+b²   (a+b)³=a³+3a²b+3ab²+b³  

(a-b)³=a³-3a²b+3ab²-b³

时间Time3*Simple Interest:

利息Interest=本金Principal

Compound Interest:A=(1+R)n;A为本利和，P为本金,R为利率,n为期数。

Time3Rate of Discount

Distance=Speed3

Discount=Cost

Pythagorean Theorem(勾股定理):直角三角形(right triangle)两直角边(legs)的平方和等于斜边 (hypotenuse)的平方。

多变形的内角和：(n-2)×180°，总对角线数为n(n-3)/2条，从每一个顶点引出的对角线数为(n-3)条;式中：n为多边形的边数

平面直角坐标系中，A(x1,y1)和B(x2,y2)是任意两点，C(x,y)是线段AB的中点，则x=(x1+x2)/2,,y=(y1+y2)/2,线段AB两端点间的距离=

平面图形的周长和面积：

Perimeter Area

Triangle 三边之和 (底×高)/2

Square 边长×4 边长的平方

Rectangle (长+宽)×2 长×宽

Parallelogram (长+宽)×2 底×高

Trapezoid 四边之和 (上底+下底)×高/2

Rhombus 边长×4 两条对角线之积的1/2

Circle 2πr=πd πr2

立体图形的表面积和体积：

Volume Surface Area

Rectangular Prism 长×宽×高 2(长×宽+长×高+宽×高)

Cube 棱长的立方 6×棱长×棱长

Right Circular Cylinder πr2h 2πr h(侧)+2πr2(底)

Sphere 4πr3/3 4πr2

Right Circular Cone πr2h/3 lr/2 (l为母线)

练习题：

What is the average (arithmetic mean) of a, b, and c ?

(1)a + 2b + 3c = 10

(2)3a + 2b + c = 14

Answer Choices

A. Statement (1) ALONE is sufficient but statement (2) ALONE is not sufficient.

B. Statement (2) ALONE is sufficient but statement (1) ALONE is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are not sufficient.

Answer:

C

Explanation:

The average of a, b, and c is a+b+c/3. Statement (1) says that a+2b+3c = 10, but there is not enough information to determine the value of a+b+c. Thus, statement (1) alone is not sufficient. Similarly, the equation statement (2) also fails to give enough information, so statement (2) alone is not sufficient. If the equations in statements (1) and (2) are added together, term by term, the result is 4a+4b+4c=24, which means that a+b+c = 6. The average is therefore 6/3 = 2. Thus, BOTH statements TOGETHER are sufficient to answer the question. The best answer is C.

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