挑战习题
1
/5
单选题
难度:
1.不等式组
的解集是( )
A
x>2
B
x<5
C
2<x<5
D
无解
提示1:
5YWI5rGC5Ye65Lik5Liq5LiN562J5byP55qE6Kej6ZuG77yM5YaN5rGC5YW25YWs5YWx6Kej
正确答案:
Qw==
6Kej77yaPGltZyB3aWR0aD05NiBoZWlnaHQ9NjIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9DNy9BQy9yQkFDRTFXYm1nYkFLaV9qQUFBRHBDQVpPWTQ5NjkucG5nIj48YnI+55Sx4pGg5b6X77yMeO+8njLvvIw8YnI+55Sx4pGh5b6X77yMeO+8nDXvvIw8YnI+5omA5Lul77yM5LiN562J5byP57uE55qE6Kej6ZuG5pivMu+8nHjvvJw177yOPGJyPuaVhemAiUPvvI4=
2
/5
单选题
难度:
2.若不等式组
无解,那么m的取值范围是( )
A
m>2
B
m<2
C
m≥2
D
m≤2
提示1:
5YWI5rGC5Ye65q+P5Liq5LiN562J5byP55qE6Kej6ZuG77yM5YaN5qC55o2u5LiN562J5byP57uE6Kej6ZuG55qE5rGC5rOV5ZKM5LiN562J5byP57uE5peg6Kej55qE5p2h5Lu277yM5Y2z5Y+v5b6X5YiwbeeahOWPluWAvOiMg+WbtO+8jg==
正确答案:
RA==
6Kej77yaPGltZyB3aWR0aD0xMjUgaGVpZ2h0PTYyIHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvOTEvQjQvckJBQ0psV2JtZ3pDaU82c0FBQURyTTNjd1pZNjY3LnBuZyI+PGJyPueUseKRoOW+l++8jHjvvJ4y77yMPGJyPueUseKRoeW+l++8jHjvvJxt77yMPGJyPuWPiOWboOS4uuS4jeetieW8j+e7hOaXoOino++8jDxicj7miYDku6XmoLnmja7igJzlsI/lpKflpKflsI/kuK3pl7Tmib7igJ3ljp/liJnvvIw8YnI+beKJpDLvvI4=
3
/5
单选题
难度:
3.将一箱苹果分给若干个小朋友,若每位小朋友分5个苹果,则还剩12个苹果;若每位小朋友分8个苹果,则有一个小朋友所分苹果不到8个.若小朋友的人数为x,则列式正确的是( )
A
0≤5x+12-8(x-1)<8
B
0<5x+12-8(x-1)≤8
C
1≤5x+12-8(x-1)<8
D
1<5x+12-8(x-1)≤8
提示1:
5qC55o2u5q+P5L2N5bCP5pyL5Y+L5YiGNeS4quiLueaenO+8jOWImei/mOWJqTEy5Liq6Iu55p6c77yb6Iul5q+P5L2N5bCP5pyL5Y+L5YiGOOS4quiLueaenO+8jOWImeacieS4gOS4quWwj+aci+WPi+aJgOWIhuiLueaenOS4jeWIsDjkuKrvvI7nlLHmraTlvpflh7rkuI3nrYnlvI/nu4TvvI4=
正确答案:
Qw==
6Kej77ya5qC55o2u5bCP5pyL5Y+L55qE5Lq65pWw5Li6eO+8jOagueaNrumimOaEj+WPr+W+l++8mjxicj4x4omkNXgrMTItOO+8iHgtMe+8ie+8nDjvvIw8YnI+5pWF6YCJ77yaQ++8jg==
4
/5
单选题
难度:
4.某班组织20名同学去春游,同时租用两种型号的车辆,一种车每辆有8个座位,另一种车每辆有4个座位,要求租用的车辆不留空座,也不能超载.租车方案共有( )种.
A
2
B
3
C
4
D
5
提示1:
6K6+56ef55So5q+P6L6GOOS4quW6p+S9jeeahOi9pnjovobvvIzmr4/ovobmnIk05Liq5bqn5L2N55qE6L2meei+hu+8jOagueaNrui9puW6p+S9jeaVsOetieS6juWtpueUn+eahOS6uuaVsOWIl+WHuuS6jOWFg+S4gOasoeaWueeoi++8jOWGjeagueaNrnjjgIF56YO95piv5q2j5pW05pWw5rGC6Kej5Y2z5Y+v77yO
正确答案:
QQ==
6Kej77ya6K6+56ef55So5q+P6L6GOOS4quW6p+S9jeeahOi9pnjovobvvIzmr4/ovobmnIk05Liq5bqn5L2N55qE6L2meei+hu+8jDxicj7moLnmja7popjmhI/lvpfvvIw4eCs0eT0yMO+8jDxicj7mlbTnkIblvpfvvIwyeCt5PTXvvIw8YnI+4oi1eOOAgXnpg73mmK/mraPmlbTmlbDvvIw8YnI+4oi0eD0x5pe277yMeT0z77yMPGJyPng9MuaXtu+8jHk9Me+8jDxicj54PTPml7bvvIx5PS0x77yI5LiN56ym5ZCI6aKY5oSP77yM6IiN5Y6777yJ77yMPGJyPuaJgOS7pe+8jOWFseaciTLnp43np5/ovabmlrnmoYjvvI48YnI+5pWF6YCJ77yaQe+8jg==
5
/5
单选题
难度:
5.关于x的不等式组
只有五个正整数解,则实数a的取值范围是( )
A
-4<a<-3
B
-4≤a≤-3
C
-4≤a<-3
D
-4<a≤-3
提示1:
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正确答案:
RA==
6Kej77yaPGltZyB3aWR0aD04NyBoZWlnaHQ9NjIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9DNy9BQy9yQkFDRTFXYm1oT1QtT25HQUFBRGtPdDN5SmM3OTEucG5nIj7vvIw8YnI+6Kej4pGg5b6X77yaeOKJpWHvvIw8YnI+6Kej4pGh5b6X77yaeO+8nDLvvIw8YnI+5YiZ5LiN562J5byP57uE55qE6Kej6ZuG5piv77yaYeKJpHjvvJwy77yOPGJyPuWImeaVtOaVsOino+aYr++8mjHvvIww77yMLTHvvIwtMu+8jC0z77yOPGJyPuagueaNrumimOaEj+W+l++8mi0077ycYeKJpC0z77yOPGJyPuaVhemAiUTvvI4=