in the xy-plane,region R consists of all points(x,y) such that 2x+3y=6. is the point(r,s) in region R?
(1) 3r+2s=6
(2)r=3 and s=2
答案是E
我选择的B,我觉得B不能满足region R也是一种否定形式啊,请大家帮我解释一下
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