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4:2=2:________

1
分析:根据比的基本性质作答,即比的前项和后项同时乘上一个数或除以一个数(0除外),比值不变.
解答:4:2,
=(4÷2):(2÷2),
=2:1;
故答案为:1.
点评:本题主要考查了化简比的方法,注意化简比的结果是一个比,它的前项和后项都是整数,并且是互质数.
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