若x/a=y/b,则:(pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)的关系是( )A 当p>q时,(pa+cx)/(qa+cy)>(pb+cy)/(qb+cy)B 当p(pb+cy)/(qb+cy)C (pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)不相等D (pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)相等E 以上结果都不正确D请
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![若x/a=y/b,则:(pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)的关系是( )A 当p>q时,(pa+cx)/(qa+cy)>(pb+cy)/(qb+cy)B 当p(pb+cy)/(qb+cy)C (pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)不相等D (pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)相等E 以上结果都不正确D请](/uploads/image/z/1113842-2-2.jpg?t=%E8%8B%A5x%2Fa%3Dy%2Fb%2C%E5%88%99%EF%BC%9A%28pa%2Bcx%29%2F%28qa%2Bcy%29%E4%B8%8E%28pb%2Bcy%29%2F%28qb%2Bcy%29%E7%9A%84%E5%85%B3%E7%B3%BB%E6%98%AF%EF%BC%88+%EF%BC%89A+%E5%BD%93p%3Eq%E6%97%B6%2C%28pa%2Bcx%29%2F%28qa%2Bcy%29%3E%28pb%2Bcy%29%2F%28qb%2Bcy%29B+%E5%BD%93p%28pb%2Bcy%29%2F%28qb%2Bcy%29C+%28pa%2Bcx%29%2F%28qa%2Bcy%29%E4%B8%8E%28pb%2Bcy%29%2F%28qb%2Bcy%29%E4%B8%8D%E7%9B%B8%E7%AD%89D+%28pa%2Bcx%29%2F%28qa%2Bcy%29%E4%B8%8E%28pb%2Bcy%29%2F%28qb%2Bcy%29%E7%9B%B8%E7%AD%89E+%E4%BB%A5%E4%B8%8A%E7%BB%93%E6%9E%9C%E9%83%BD%E4%B8%8D%E6%AD%A3%E7%A1%AED%E8%AF%B7)
若x/a=y/b,则:(pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)的关系是( )A 当p>q时,(pa+cx)/(qa+cy)>(pb+cy)/(qb+cy)B 当p(pb+cy)/(qb+cy)C (pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)不相等D (pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)相等E 以上结果都不正确D请
若x/a=y/b,则:(pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)的关系是( )
A 当p>q时,(pa+cx)/(qa+cy)>(pb+cy)/(qb+cy)
B 当p(pb+cy)/(qb+cy)
C (pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)不相等
D (pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)相等
E 以上结果都不正确
D
请主要描述一下解题思路、过程,
若x/a=y/b,则:(pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)的关系是( )A 当p>q时,(pa+cx)/(qa+cy)>(pb+cy)/(qb+cy)B 当p(pb+cy)/(qb+cy)C (pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)不相等D (pa+cx)/(qa+cy)与(pb+cy)/(qb+cy)相等E 以上结果都不正确D请
这道题,如果你去解的话,计算量很大
其实做题讲方法的
就拿这道题来说
明显选D
用排除法
如果A正确,那么C正确,
如果B正确,那么C也正确
如果C正确,那么A或B总有一正确
如果E正确,那么CD矛盾,总一个正确
所以只有选D才能保证本题符合题意
用特殊值算一下