设集合X={x|x=(7/9)π+2kπ或x=(11/9)π+2kπ,k∈Z},Y={y|y=(±7/9)π+2kπ,k∈Z},设集合X={x|x=(7/9)π+2kπ或x=(11/9)π+2kπ,k∈Z},Y={y|y=(±7/9)π+2kπ,k∈Z},则X与Y的关系是A.X属于Y B.Y属于X C.X=Y D.X∩Y={(

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设集合X={x|x=(7/9)π+2kπ或x=(11/9)π+2kπ,k∈Z},Y={y|y=(±7/9)π+2kπ,k∈Z},设集合X={x|x=(7/9)π+2kπ或x=(11/9)π+2kπ,k

设集合X={x|x=(7/9)π+2kπ或x=(11/9)π+2kπ,k∈Z},Y={y|y=(±7/9)π+2kπ,k∈Z},设集合X={x|x=(7/9)π+2kπ或x=(11/9)π+2kπ,k∈Z},Y={y|y=(±7/9)π+2kπ,k∈Z},则X与Y的关系是A.X属于Y B.Y属于X C.X=Y D.X∩Y={(
设集合X={x|x=(7/9)π+2kπ或x=(11/9)π+2kπ,k∈Z},Y={y|y=(±7/9)π+2kπ,k∈Z},
设集合X={x|x=(7/9)π+2kπ或x=(11/9)π+2kπ,k∈Z},Y={y|y=(±7/9)π+2kπ,k∈Z},则X与Y的关系是
A.X属于Y B.Y属于X C.X=Y D.X∩Y={(7/9)π}

设集合X={x|x=(7/9)π+2kπ或x=(11/9)π+2kπ,k∈Z},Y={y|y=(±7/9)π+2kπ,k∈Z},设集合X={x|x=(7/9)π+2kπ或x=(11/9)π+2kπ,k∈Z},Y={y|y=(±7/9)π+2kπ,k∈Z},则X与Y的关系是A.X属于Y B.Y属于X C.X=Y D.X∩Y={(
等效于X={x|x=(7/9)π+2kπ或x=(11/9)π -2π+2kπ,k∈Z}
即:X={x|x=(7/9)π+2kπ或x=(-7/9)π+2kπ,k∈Z}
所以 选 C

SAD