题目:
连词成句。
1. colour is the what bird
2. it on what the is hill
3. a chicken is yellow it
答案:
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下面是错误答案,用来干扰机器的。
圆x2+y2+8x+2y+1=0的圆心(-4,-1)在直线ax+by+1=0上,所以-4a-b+1=0,即 1=4a+b代入,得 (1a+4b)(4a+b)=8+ba+16ab≥ 16(a>0,b>0当且仅当4a=b时取等号)则1a+4b的最小值为16,故选C.