若a>b,下列不等式正确的是( )A.a-1<b-1B.-a<-bC.8a<8bD.0a<0b
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若a>b,下列不等式正确的是( )A.a-1<b-1 | B.-a<-b | C.8a<8b | D.0a<0b |
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答案
A、两边都减去1,不等号方向不变,故本选项错误. B、两边同乘以-1,不等号方向改变,故本选项正确. C、两边同乘以正数,不等号方向不变,故本选项错误. D、两边都乘以0,应该相等,故本选项错误. 故选B. |
举一反三
Given a,b,c satisfy c<b<a and ac<0,then which one is not sure to be correct in the following inequalities?( ) (英汉词典:besureto确定;correct正确的;inequality不等式) |
已知a>b,则-______-;已知a<b,则a-6______b-6. |
Given a,b,c satisfy c<b<a and ac<0,then which one is not sure to be correct in the following inequalities?( ) (英汉词典:besureto确定;correct正确的;inequality不等式) |
已知x满足不等式|ax-1|>ax-1 (其中a≠0),那么x的取值范围是 ______. |
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