搜狗做题网一道SAT数学题,全英文,看不懂题.
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一道SAT数学题,全英文,看不懂题.
the coordinates of point A in the figure above are (p,r), where [p]>[r], Which of the following could be the slope of AB?
附件能看到吗?[p]的意思是p的绝对值,这道题确实好难啊.
选项：
a.-2 b.-1/2 c.0 d.2/3 e.5/2 最后答案是b...只有横纵坐标相等斜率才能是1/2啊
the coordinates of point A in the figure above are (p,r), where [p]>[r], Which of the following could be the slope of AB?
附件能看到吗?[p]的意思是p的绝对值,这道题确实好难啊.
选项：
a.-2 b.-1/2 c.0 d.2/3 e.5/2 最后答案是b...只有横纵坐标相等斜率才能是1/2啊
题目的意思是：上题中A点的坐标是(p,r),其中[p]>[r],则AB的斜率可能是下面的哪一个?
答案：因为AB经过2,4象限,所以p和r符号相反.
又因为AB经过原点,所以斜率k=r/p,由[p]>[r],可知[r/p]
答案：因为AB经过2,4象限,所以p和r符号相反.
又因为AB经过原点,所以斜率k=r/p,由[p]>[r],可知[r/p]