GRE数学考生回忆（11）
<p> 56、给了一个<span word="xy">xy</span>坐标轴,<span word="P">P</span>点坐标,<span word="Q">Q</span>点坐标.问<span word="P">P</span>和<span word="Q">Q</span>满足下面哪一个... <span word="p">p</span>+<span word="q">q</span>=4----这是我的第一题....多么弱智的题...我看了半天以为我做错了..呵呵~~~开始都会有点慌 即求两点坐标满足哪个方程，则<span word="p">p</span>+<span word="q">q</span>=4</p><p> 57、先是一大堆话告诉你交集和并集的定义--这个大家都知道,我就没看, 直接看题 然后说<span word="C">C</span>集合={1,2,3,7,8,9,12,14,16,18},<span word="D">D</span>集合={所有1到21的偶数},求<span word="CD">CD</span>里面有多少元素 14个 <span word="CD">CD</span>={1,2,3,7,8,9,12,14,16,18,4,6,10,20}</p><p> 58、某工厂四月的产量比三月少10%,五月又比四月少10%,现在已知五月的产量是16.2<span word="million">million</span>,请问三月生产了多少? 设3月份为<span word="x">x</span>，则 <span word="x">x</span>90%90%=16.2 得<span word="x">x</span>=20<span word="million">million</span></p><p> 59、一个班有11人学习<span word="piano">piano</span>,有14人学习<span word="guitar">guitar</span>,有10人学习<span word="violin">violin</span>,总共有3个人这三种乐器都学了,有20个人只学了一种乐器,请问学了两种乐器的有多少人</p><p> <span word="x">x</span>+<span word="a">a</span>+<span word="b">b</span>+3=11</p><p> <span word="y">y</span>+<span word="a">a</span>+<span word="c">c</span>+3=14</p><p> <span word="z">z</span>+<span word="b">b</span>+<span word="c">c</span>+3=10</p><p> <span word="x">x</span>+<span word="y">y</span>+<span word="z">z</span>=20</p><p> 得：<span word="x">x</span>+<span word="y">y</span>+<span word="z">z</span>+2=11+14+10-9=26 所以<span word="a">a</span>+<span word="b">b</span>+<span word="c">c</span> = 3</p><p> 60、 ^2 = 2 2 =310 2= 310 26 52</p><p> </p>
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