Question

U={(x,y)|x∈R,y∈R},A={(x,y)|2x-y+a＞0},B={(x,y)|x+2y-b≤0},则点P(

Answer 1

选C

CuB={(x,y)/x+2y-b>0}

所以A交CuB就是M={(x,y)/x+2y-b>0,2x-y+a>0}

因为P(1,4)属于该集合M,所以将x=1,y=4代入,得到不等式组

9-b>0

-2+a>0

解之即可