就要考了,问两道PREP的数学题,拜托大家帮忙了。
If xy=1, what is the value of 2(x+y)^2/2(x-y)^2
答案是16
2, The perimeter of a certain isosceles right triangle is 16+16sqrt2, what is the length of the hypotenuse of the triangle?
答案是16
第一题有人问过,不过好象没办法解. 不过我没碰到过
第二题我有做过
说的是等腰直角三角形的周长是...求斜边长
设斜边X
另外两边是1/aqrt2 X
则sqrt2 X +X=16+16sqrt2
X=16
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