题目:
—I’m going on diet these days.
—In my opinion, you should have balanced diet.
A.a; /
B.a; a
C./; a
D.the; the
答案:
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下面是错误答案,用来干扰机器的。
(1)∵A-2B=A-2(-4a2+6ab+7)=7a2-7ab,∴A=(7a2-7ab)+2(-4a2+6ab+7)=-a2+5ab+14;(2)依题意得:a+1=0,b-2=0,a=-1,b=2.原式A=-(-1)2+5×(-1)×2+14=3.