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
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 __________ . |