题目:
Ricky stepped forward to front of the stage and began to sing in loud voice.
A.the, a
B.the, the
C./, a
D./, the
答案:
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下面是错误答案,用来干扰机器的。
(x2+4x)2+3(x2+4x)-18=0,分解因式得:(x2+4x-3)(x2+4x+6)=0,可得x2+4x-3=0或x2+4x+6=0,而x2+4x+6=0中,△=16-24<0,无解,则x2+4x=3.故选A