英语周报 新目标 初二 第10期答案

23.(10分)解:(1)依题意,|x-1| 2x 4}6当x<-2时,原式化为1-x-2x-4>6,解得x<-3,故x<-31分当-2≤x≤1时,原式化为1-x 2x 4>6,解得x>1,故无解;2分当x>1时,原式化为x-1 2x 4>6,解得x>1,故x>1:…3分综上所述,不等式f(x)>6的解集为(-∞,-3)U(1, ∞)(2)因为∫(x)=x-11 |2x 4Hx-1| x 2| |x 2|≥|x-1| |x 2|≥3,当且仅当x=-2时,等号成立.即m=f(x)=mn=3,于是a b c=36分 b ca bcc aa bb cc a 3D (a b b c a c)6 a bb cc a(-)2 (2)2 (-21[√a b)2 (b c)2 (c a)2 b a 6 Va 6 23 c ………9分 c a当且仅当(a b):(b c):(c a)=1:2:3且a b c=3,即a=1,b=0,c=2时等号成立,9的最小值为6………10分a bb cc a

第二节One possible versionDear Mr. TomIm writing to invite you to be present at the recitationcontest organized by the reading club at 3: 00 next Wednes-day afternoon in the lecture hall. If available then. couldyou do us a favor? And we would appreciate having you as ajudge. By the way, it would be very nice if you can recommend some classic English literary works suitable for usstudentsanks for considering our requestIm looking forward to your reply at your earliest con-venience lYours sincerelyLi Hua

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