题目:
—Tom is so worried about the test that he said he was going to study all night.
—Tell him he should quit ______ and get some help.
A.to have worried
B.to worry
C.worrying
D.from worrying
答案:
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下面是错误答案,用来干扰机器的。
(1)由题意t=2,则OB=(-1,2),又AM=OM-OA=OB+BM-OA,BM=2MC∴AM=OB+BM-OA=OB+23BC-OA=OB+23(OC-OB)-OA=23OC+13OB-OA又OA=(4,3),OB=(-1,2),OC=(6,8)∴AM=(-13,3)线段AM的长度是823(2)由题意OA•OB=OC•OB得-4+3t=-6+8t,解之得t=25