设集合M={a\a=kπ/2-π/5,k属于z},N={a\-π
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设集合M={a\a=kπ/2-π/5,k属于z},N={a\-π
设集合M={a\a=kπ/2-π/5,k属于z},N={a\-π
设集合M={a\a=kπ/2-π/5,k属于z},N={a\-π
{-π/5,3π/10,4π/5},k的值一个个取就行