挑战习题
1
/5
单选题
难度:
1.9的平方根是( )
A
±3
B
3
C
-3
D
±
提示1:
5LiA5Liq5q2j5pWw55qE5bmz5pa55qC55pyJ5Lik5Liq
正确答案:
QQ==
6Kej77yaOeeahOW5s+aWueagueaYr8KxMw==
2
/5
单选题
难度:
2.下列说法正确的是( )
A
|-2|=-2
B
0的倒数是0
C
4的平方根是2
D
-3的相反数是3
提示1:
5Yip55So57ud5a+55YC855qE5Luj5pWw5oSP5LmJ77yM5YCS5pWw55qE5a6a5LmJ77yM5bmz5pa55qC55Y+K55u45Y+N5pWw55qE5a6a5LmJ5Yik5pat5Y2z5Y+v77yO
正确答案:
RA==
6Kej77yaQeOAgXwtMnw9Mu+8jOmUmeivr++8mzxicj5C44CBMOayoeacieWAkuaVsO+8jOmUmeivr++8mzxicj5D44CBNOeahOW5s+aWueagueS4usKxMu+8jOmUmeivr++8mzxicj5E44CBLTPnmoTnm7jlj43mlbDkuLoz77yM5q2j56Gu77yMPGJyPuaVhemAiUQ=
3
/5
单选题
难度:
3.若x是0.25的平方根,则x的值是( )
A
0.5
B
-0.5
C
0.05
D
±0.5
提示1:
5qC55o2u5bmz5pa55qC555qE5a6a5LmJ77yM5rGC5pWweOeahOW5s+aWueague+8jOeUseatpOWNs+WPr+ino+WGs+mXrumimO+8jg==
正确答案:
RA==
6Kej77yaMC4yNeeahOW5s+aWueagueS4uu+8msKxMC4177yOPGJyPuaVhemAie+8mkTvvI4=
4
/5
单选题
难度:
4.一个正数的平方根为2x+1和x-7,则这个正数为( )
A
5
B
10
C
25
D
±25
提示1:
5qC55o2u5q2j5pWw5bmz5pa55qC55LqS5Li655u45Y+N5pWw77yM5Y+v5b6X5LiA5Liq5bmz5pa55qC555qE5ZKM5Li6MO+8jOagueaNruino+aWueeoi++8jOWPr+W+l3jnmoTlgLzvvIzmoLnmja7lubPmlrnov5DnrpfvvIzlj6/lvpfnrZTmoYjvvI4=
正确答案:
Qw==
6Kej77yb5LiA5Liq5q2j5pWw55qE5bmz5pa55qC55Li6MngrMeWSjHgtN++8jDxicj7iiLQyeCsxK3gtNz0wPGJyPng9Mu+8jDxicj4yeCsxPTU8YnI+77yIMngrMe+8iTxzdXA+Mjwvc3VwPj01PHN1cD4yPC9zdXA+PTI177yMPGJyPuaVhemAie+8mkPvvI4=
5
/5
单选题
难度:
5.下列说法正确的是( )
A
-1的平方根是-1
B
任何一个非负数的立方根都是非负数
C
如果一个数有平方根,那么这个数的平方根一定有两个
D
4的平方根是2
提示1:
QeOAgeagueaNrui0n+aVsOayoeacieW5s+aWueagueWNs+WPr+WIpOWumu+8mzxicj5C44CB5qC55o2u56uL5pa55qC555qE5a6a5LmJ5Y2z5Y+v5Yik5a6a77ybPGJyPkPjgIHmoLnmja7mraPmlbDnmoTlubPmlrnmoLnmnInkuKTkuKrvvIww55qE5bmz5pa55qC55pivMOWNs+WPr+WIpOWumu+8mzxicj5E44CB5qC55o2u5bmz5pa55qC555qE5a6a5LmJ5Y2z5Y+v5Yik5a6a77yO
正确答案:
Qg==
6Kej77yaQeOAgS0x5peg5bmz5pa55qC55Y+v6KiA77yM5pWF6YCJ6aG56ZSZ6K+v77ybPGJyPkLjgIHku7vkvZXkuIDkuKrpnZ7otJ/mlbDnmoTnq4vmlrnmoLnpg73mmK/pnZ7otJ/mlbDvvIzmlYXpgInpobnmraPnoa7vvJs8YnI+Q+OAgeWboOS4ujDnmoTlubPmlrnmoLnmmK8w77yM5pWF6YCJ6aG56ZSZ6K+v77ybPGJyPkTjgIE055qE5bmz5pa55qC55pivwrEy77yM5pWF6YCJ6aG56ZSZ6K+v77yOPGJyPuaVhemAiULvvI4=