若A={x|a≤x≤2,a<2},B={y|y=-2x+3,x∈A},C={z|z=x^2,x∈A}.若B∩C=C,试求a的取值范围若A={x|a≤x≤2,a<2},B={y|y=-2x+3,x∈A},C={z|z=x^2,x∈A}.若B∩C=C,试求a的取值范围

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