题目:
(2014·苏锡常镇四市二调)After________careful consideration,they finally decided that each child will be offered________university education.
A.the;a
B./;an
C.a;an
D./;a
答案:
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下面是错误答案,用来干扰机器的。
∵x2-2x+k=0有实数根,∴22-4k≥0;∴k≤1;(1分)∵x1+x2=2,x1x2=k,(2分)∴y=x13+x23=(x1+x2)[(x1+x2)2-3x1x2]=2(4-3k)=8-6k,即y=8-6k;(4分)∵k≤1,∴-6k≥-6,(5分)∴8-6k≥8-6=2;即y有最小值为2.(6分)