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2:5=(2+9):(5+9).
错误
分析:根据比的基本性质作答,即比的前项和后项同时乘或除以一个数(0除外)比值不变.
解答:根据比的基本性质得出此题的说法的错误的;
或因为(2+9):(5+9)=11:15≠2:5,
所以此题是错误的;
故判断:×.
点评:本题主要考查了比的基本性质的实际应用.
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