下列各对数,+(-2)与-2,+(+2)与+2,-(-2)与+(-2),-(+2)与+(-2),-(+2)与+(+2),+2与-2,-|-2|与-2,中,互为相
题型:单选题难度:简单来源:不详
下列各对数,+(-2)与-2,+(+2)与+2,-(-2)与+(-2),-(+2)与+(-2),-(+2)与+(+2),+2与-2,-|-2|与-2,中,互为相反数的有( ) |
答案
+(-2)与-2,即-2与-2,不是相反数; +(+2)与+2,即2与2,不是相反数; -(-2)与+(-2),即2与-2,是相反数; -(+2)与+(-2),即-2与-2,不是相反数; -(+2)与+(+2),即-2与2,是相反数; +2与-2,是相反数; -|-2|与-2,即-2与-2不是相反数; 故互为相反数的有3对. 故选:A. |
举一反三
若一个数的相反数为-1,则这个数为______,这个数的倒数为______. |
已知a,b为有理数,且a>0,b<0,a<|b|,则a,b,-a,-b的大小顺序是( )A.b<-a<a<-b | B.-a<a<-b<b | C.-a<b<a<-b | D.-b<a<-a<b |
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若数a,b互为相反数,数c,d互为倒数,则代数式-=______. |
如果a>0,b<0,且a+b<0,那么下列式子正确的是( )A.-b<-a<b<a | B.b<-a<-b<a | C.b<-a<a<-b | D.-a<b<a<-b |
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