求解一道Gmat数据充分题If x and y are integers,is y an even integer?(1) 2y – x = x^2 – y^2(2) x is an odd integer.条件(1)单独就是充分的
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![求解一道Gmat数据充分题If x and y are integers,is y an even integer?(1) 2y – x = x^2 – y^2(2) x is an odd integer.条件(1)单独就是充分的](/uploads/image/z/13018838-14-8.jpg?t=%E6%B1%82%E8%A7%A3%E4%B8%80%E9%81%93Gmat%E6%95%B0%E6%8D%AE%E5%85%85%E5%88%86%E9%A2%98If+x+and+y+are+integers%2Cis+y+an+even+integer%3F%281%29+2y+%E2%80%93+x+%3D+x%5E2+%E2%80%93+y%5E2%282%29+x+is+an+odd+integer.%E6%9D%A1%E4%BB%B6%EF%BC%881%EF%BC%89%E5%8D%95%E7%8B%AC%E5%B0%B1%E6%98%AF%E5%85%85%E5%88%86%E7%9A%84)
求解一道Gmat数据充分题If x and y are integers,is y an even integer?(1) 2y – x = x^2 – y^2(2) x is an odd integer.条件(1)单独就是充分的
求解一道Gmat数据充分题
If x and y are integers,is y an even integer?
(1) 2y – x = x^2 – y^2
(2) x is an odd integer.
条件(1)单独就是充分的
求解一道Gmat数据充分题If x and y are integers,is y an even integer?(1) 2y – x = x^2 – y^2(2) x is an odd integer.条件(1)单独就是充分的
From (1),we can know that x^2+x=y^2+2y.Because x is an odd integer,x^2 is an odd integer too.So the resuit of x^2+2 is an even integer.That is to say y^2+2y is an even integer.If y is an odd integer,y^2 is an odd integer while 2y is an even integer.When we plus y^2 and 2y,we will get an odd integer.It isn't correspond to the fact.So what we supposed just now is not true .Then,we can know that y is an even integer.其实题目不难的,建议你去西博海外听听他们免费的公益课.