一道sat数学 if 0≤x≤8 and -1≤y≤3,which of the following gives the

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一道sat数学 if 0≤x≤8 and -1≤y≤3,which of the following gives the set of all possible values of
if 0≤x≤8 and -1≤y≤3,which of the following gives the set of all possible values of xy?
A.xy=4
B.0≤xy≤24
C.-1≤xy≤11
D.-1≤xy≤24
E.-8≤xy≤24
我选了B不对请跟我说下怎么做很久以前学的都忘了

找极值点,两个都正数或负数,就找出绝对值最大的这里是（x,y）=（8,3）
所以xy最大为24
最小同理,（x,y）=（8,-1）,此时xy=-8
因此选e

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