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  • 1. If x and y are integers and xy+x^2 is oddh which of the following statements must be true?① x is odd② y is odd③ x+y i

    1. If x and y are integers and xy+x^2 is oddh which of the following statements must be true?① x is odd② y is odd③ x+y is oddA.?、貰.?、跜. ① and?、贒.?、佟nd?、跡. ② and?、?. For how many integers n is (2n+1)(3n-1) a negative number?A. NoneB. OneC. TwoD. ThreeE. Four求詳解
    數(shù)學(xué)人氣:696 ℃時(shí)間:2020-05-12 11:54:24
    優(yōu)質(zhì)解答
    1、x和y都是整數(shù),“xy+x^2是奇數(shù)”就是說(shuō):x*(x+y)是奇數(shù).我覺(jué)得這道題問(wèn)的是哪種組合是正確的.因?yàn)閱为?dú)看,①②③都是推不出來(lái)的【也就是說(shuō)A和B不對(duì)】,如果x是奇數(shù),y也是奇數(shù),那么x+y成了偶數(shù),x*(x+y)也就成了偶數(shù)...
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