问题
选择题
方程（x-1）2=9的解是（ ）
A．x1=3，x2=-3
B．x1=4，x2=-4
C．x1=4，x2=-2
D．x=4
答案
开方得：x-1=3或x-1=-3，
解得：x1=4，x2=-2．
故选C
搜题请搜索小程序“爱下问搜题”
方程（x-1）2=9的解是（ ）
A．x1=3，x2=-3
B．x1=4，x2=-4
C．x1=4，x2=-2
D．x=4
开方得：x-1=3或x-1=-3，
解得：x1=4，x2=-2．
故选C
请阅读下面各小题，从方框中选择适当的短语填空，并将其序号填写到答题卷的相应位置。每个词语限用一次。
小题2:—Let’s keep the secret between us . —I won’t tell it to _________ . 小题3:________ the policeman, the Blacks finally found their lost cat on the street . 小题4:—Who is that man ________ ? —He is the world champion we talked about just now . 小题5:Some old people have nothing better to do than to ________their unhappiness . 小题6:—I __________several times during the night . —What’s wrong with you ? 小题7:—My company _______me _________a car . —Oh , you’re a lucky dog . 小题8:—I dropped my book on the floor . Could you please help me ________ it ________? —Wait a minute . 小题9:—How cold the weather is today ! —Yes , and it’ll be even colder _________ . （小题10:Children can’t depend on their parents __________ . |
