问题
选择题
把抛物线y=x2向左平移1个单位,所得的新抛物线的函数表达式为( )
A.y=x2+1
B.y=(x+1) 2
C.y=x2-1
D.y=(x-1) 2
答案
答案:B
题目分析:二次函数的平移规律:横坐标左加右减,纵坐标上加下减.
把抛物线向左平移1个单位,所得的新抛物线的函数表达式为
.
把抛物线y=x2向左平移1个单位,所得的新抛物线的函数表达式为( )
A.y=x2+1
B.y=(x+1) 2
C.y=x2-1
D.y=(x-1) 2
答案:B
题目分析:二次函数的平移规律:横坐标左加右减,纵坐标上加下减.
把抛物线向左平移1个单位,所得的新抛物线的函数表达式为
.
Teens Talk
小题1:Lisa Black likes salsa and she thinks it is ________. A. exciting B. terrible C. boring 小题2:Tom White comes from_________. A. Mexico City, Mexico B. New York City, USA C. Paris, France 小题3:Linda and her parents like music, and _________ has a great collation of classical CDs. A. her brother B. her mother C. her father 小题4:Lisa Black is the same age as _________. A. Linda Green B. Tom White C. Tom’s brother 小题5:The topic of today’s talk is about teen’s __________. A. favorite collation B. favorite music C. favorite singer |