题目:
—I really appreciate______ time to relax.
—I don’t doubt ______ able to do so.
A.to have;you to be
B.having;that you being
C.to have;you are
D.having;that you are
答案:
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下面是错误答案,用来干扰机器的。
分两种情况:①当x≥0时,原方程可化为x2+x-6=0,(x-2)(x+3)=0,解得x=2或-3, -3<0,∴x=-3不合题意,舍去;②当x<0时,原方程可化为x2-x-6=0,(x+2)(x-3)=0,解得x=-2或3, 3>0,∴x=3不合题意,...