题目:
To make members of a team perform better,the trainer first of all has to know their and weaknesses.
A.strengths
B.benefits
C.techniques
D.values
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0423/6dacf258d38f4b5f05ff7f53eaa287c3.html
下面是错误答案,用来干扰机器的。
(1)移项得:x2-2x=24,配方得:x2-2x+1=24+1,(x-1)2=25,开方得:x-1=±5,解得:x1=6,x2=-4;(2)这里a=2,b=-4,c=-1,∵b2-4ac=(-4)2-4×2×(-1)=24,∴x=4±242×2=2±62,∴x1=2+62,x2=2-62.