下面GMAT思为大家整理了GMAT数学例题详解,供考生们参考,以下是详细内容。
16、坐标图上画出两根线段,相交于一点,求这点的坐标。两根线段的另一头分别为(0,0)和(5,3),线段1的SLOPE为1/8,线段2的SLOPE为2/5。
【答案】
【思路】已知一点做标与斜率可得出直线方程, 分别为:y=1/8x y=2/5x+1解方程组即为交点坐标.
17、
O
X X
X X X
X X X X
X X X X X
凹凹凹凹
上图的第一行的O表示一个小球。第2、3、4行的X表示障碍物。第6行的凹表示小凹槽。小球从上落下,掉到第3行时受中间的障碍物阻滞,会向左或向右的机率是各百分之五十。以下亦然。
问:最后掉到第6行的第二个小凹槽的机率有多大?
【答案】3/8
【思路】画图作吧.
O
X X
X X X
X 1/2 1/2 X
X 1/4 1/4+1/4 1/4 X
凹 1/8+1/4 凹 凹
18、五个数:X,Y,Z,5,7,他们的算术mean is 8,下面那个对?
(1)The range of the five numbers is 2 or more;
(2)AT least one of x,y,z is more than 9;
【答案】12
【思路】因为mean=8, so x+y+z=28, 那么x,y,z最接近只能为8,9,11 so range2.中强调range=2包括2所以认为对.
由x+y+z=28可知, x,y,z平均数9所以正确.
19、If for integers C, 6
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