y=2x+3是增函数,所以B的范围是[-1,2a+3]
根据-2≤x≤a,A非空,则a≥-2,
z=x^2得讨论大于2还是大于-2小于2,
a≥2时M的范围是[0,a^2],
-2≤a
一道关于集合的高中数学题
一道关于集合的高中数学题
A={x|-2≤x≤a｝ B={y|y=2x+3,x∈A} M={z|z=x^2,x∈A} M∩B=M,求a范围
A={x|-2≤x≤a｝ B={y|y=2x+3,x∈A} M={z|z=x^2,x∈A} M∩B=M,求a范围
数学人气：343 ℃时间：2019-10-09 01:59:35
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