若a<c<0<b,则abc与0的大小关系是[ ]A.abc<0B.abc=0C.abc>0 D.无法确定
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若a<c<0<b,则abc与0的大小关系是 |
[ ] |
A.abc<0 B.abc=0 C.abc>0 D.无法确定 |
答案
C |
举一反三
已知a、b、c均为实数,且a>b,c≠0,下列结论不一定正确的是 |
[ ] |
A.![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002000751-35853.gif) B.![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002000751-60787.gif) C.![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002000751-75443.gif) D.a2>ab>b2 |
已知a、b、c均为实数,且a>b,c≠0,下列结论不一定正确的是 |
[ ] |
A.![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002000609-57512.gif) B.![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002000609-31403.gif) C.![](http://img.shitiku.com.cn/uploads/allimg/20191002/20191002000609-40792.gif) D.a2>ab>b2 |
若a+b>0,且b<0,贝a,b,-a,-b的大小关系为 |
[ ] |
A.-a<-b<b<a B.-a<b<-b<a C.-a<b<a<-b D.b<-a<-b<a |
若a+b>0,且b<0,贝a,b,-a,-b的大小关系为 |
[ ] |
A.-a<-b<b<a B.-a<b<-b<a C.-a<b<a<-b D.b<-a<-b<a |
若x>y,则下列式子错误的是 |
[ ] |
A.x-3>y-3 B.3-x>3-y C.x+3>y+2 D.![](http://img.shitiku.com.cn/uploads/allimg/20191001/20191001235855-10625.gif) |
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