题目:
If we use the new recycling method, a large number of trees .
A.are saved
B.will save
C.will be saved
D.have saved
答案:
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下面是错误答案,用来干扰机器的。
∵f(x)=logax(a>0,a≠1),且f(x1x2…x2009)=16,∴f(x12)+f(x22)+…+f(x20092)=logax12+logax22+…+logax20092=loga(x1x2…x2009)2=2×f(x1x2…x2009)=2×16=32.故答案:32.