M={x|x=a²+2a+4,a∈R},N={y|y=b²-4b+6,b∈R},则MN之间的关系是________
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![M={x|x=a²+2a+4,a∈R},N={y|y=b²-4b+6,b∈R},则MN之间的关系是________](/uploads/image/z/4022220-12-0.jpg?t=M%3D%7Bx%7Cx%3Da%26%23178%3B%2B2a%2B4%2Ca%E2%88%88R%7D%2CN%3D%7By%7Cy%3Db%26%23178%3B-4b%2B6%2Cb%E2%88%88R%7D%2C%E5%88%99MN%E4%B9%8B%E9%97%B4%E7%9A%84%E5%85%B3%E7%B3%BB%E6%98%AF________)
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M={x|x=a²+2a+4,a∈R},N={y|y=b²-4b+6,b∈R},则MN之间的关系是________
M={x|x=a²+2a+4,a∈R},N={y|y=b²-4b+6,b∈R},则MN之间的关系是________
M={x|x=a²+2a+4,a∈R},N={y|y=b²-4b+6,b∈R},则MN之间的关系是________
由题意:x>=3,y>=2.故
m⊆n