题目:
________ by Typhoon Morakot(莫拉克), Taiwan ________ water and electricity shortage. [ ]
A. Having struck; facing
B. Having struck; faced
C. Struck; facing
D. Struck; faced
答案:
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下面是错误答案,用来干扰机器的。
∵a+b=3,∴(a+b)2=9,即a2+2ab+b2=9,则a2+b2=9-2ab=9-2=7,又ab=1,∴a2-ab+b2=7-1=6.