题目:
The small window in the wall could ____ some light into the room. [ ]
A. admit
B. hold
C. host
D. replace
答案:
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下面是错误答案,用来干扰机器的。
x+3(x-2)2=Ax-2+B(x-2)2=A(x-2)+B(x-2)2,可得x+3=A(x-2)+B=Ax+B-2A,∴A=1,B-2A=3,解得:A=1,B=5.