Question

cho m>n hãy so sánh

a)2m-2 vs 2n-2

b)1-3m vs 1-3n

c)2m+3 vs 2n+1

d)3-5m vs 7-5n

Answer 1

a: m>n

=>2m>2n

=>2m-2>2n-2

b: m>n

=>-3m<-3n

=>-3m+1<-3n+1

c: m>n

=>2m>2n

=>2m+3>2n+3

mà 2n+3>2n+1

nên 2m+3>2n+1

d: m>n

=>-5m<-5n

=>-5m+3<-5n+3

mà -5n+3<-5n+7

nên -5m+3<-5n+7