a)Ta có:

\(\frac{419}{-723}< 0< \frac{-697}{-313}\)

\(\Rightarrow\frac{419}{-723}< \frac{-697}{-313}\)

c)\(\frac{17}{215}>\frac{17}{314}\)

d)Ta có:

\(\frac{11}{54}< \frac{22}{54}< \frac{22}{37}\)

\(\Rightarrow\frac{11}{54}< \frac{22}{37}\)

e)Ta có:

\(\frac{-385}{-126}>0>\frac{-57}{3461}\)

\(\Rightarrow\frac{-385}{-126}>\frac{-57}{3461}\)

f)Ta có:

\(\frac{123}{109}>1>\frac{556}{789}\)

\(\Rightarrow\frac{123}{109}>\frac{556}{789}\)

g)Ta có:

\(\frac{-56}{57}>-1>\frac{-49}{47}\)

\(\Rightarrow\frac{-56}{57}>\frac{-49}{47}\)

ta có : 1 - \(\frac{47}{57}\)= \(\frac{10}{57}\)
          \(1-\frac{66}{76}=\frac{10}{76}\)
Vì \(\frac{10}{57}>\frac{10}{76}\Rightarrow\frac{47}{57}>\frac{66}{76}\)

47<66; 57<76

vậy 47/57<66/76

47/57<66/76

\(\frac{43}{47}\) và \(\frac{53}{57}\)

Phương pháp 1 , dùng phần bù , phần hơn :

Để bằng 1 , \(\frac{43}{47}\) phải cộng thêm : 1 - \(\frac{43}{47}\) = \(\frac{4}{47}\)

Để bằng 1 . phân số \(\frac{53}{57}\) phải cộng thêm : 1 - \(\frac{53}{57}\) = \(\frac{4}{57}\)

Do \(\frac{4}{57}\) < \(\frac{4}{47}\) nên \(\frac{43}{47}\) < \(\frac{53}{57}\) [ do dùng phần bù nhiều hơn nên bé hơn ]

\(\frac{12}{47}\)và \(\frac{19}{77}\)

Dùng phân số trung gian :

\(\frac{12}{47}\)> \(\frac{12}{48}\) = \(\frac{1}{4}\) ; \(\frac{19}{77}\)< \(\frac{19}{76}\) = \(\frac{1}{4}\)

Vì \(\frac{12}{47}\)> \(\frac{1}{4}\) > \(\frac{19}{77}\) nên \(\frac{12}{47}\) > \(\frac{19}{77}\)

a.1 - 43/47 = 4/47 ; 1 - 53/57 = 4/57. Vì 4/47 > 4/57 nên 53/57 > 43/47

b.12/47 = 0,255 ; 19/77 = 0,246. Vì 0,255 > 0,246 nên 12/47 > 19/77

a,Cho \(a,b,c\in N\left(a,b,c\ne0\right)\).và \(a< b\)CMR:\(\frac{a}{b}< \frac{a+c}{b+c}\)

(Nhân chéo mà chứng minh)

Áp dụng:\(\frac{43}{47}< \frac{43+10}{47+10}=\frac{53}{57}\)

b,Ta có:\(\frac{12}{47}>\frac{12}{48}=\frac{1}{4}=\frac{19}{76}>\frac{19}{77}\)

\(\Rightarrow\frac{12}{47}>\frac{19}{77}\)

a, <=> (59-x/41 + 1) + (57-x/43 + 1) + (55-x/45 + 1) + (53-x/47 + 1) + (51-x/49 + 1) = 0

<=> 100-x/41 + 100-x/43 + 100-x/45 + 100-x/47 + 100-x/49 = 0

<=> (100-x).(1/41+1/43+1/45+1/47+1/49) = 0

<=> 100-x=0 ( vì 1/41+1/43+1/45+1/47+1/49 > 0 )

<=> x=100

Vậy x = 100

b, <=> 2-x/2016 + 1 = (1-x/2017 + 1) + (1 - x/2018)

<=> 2018-x/2016 = 2018-x/2017 + 2018-x/2018

<=> 2018-x/2016 - 2018-x/2017 - 2018-x/2018 = 0

<=> (2018-x).(1/2016-1/2017-1/2018) = 0

<=> 2018-x=0 ( vì 1/2016-1/2017-1/2018 khác 0 )

<=> x=2018

Vậy x=2018

Tk mk nha

\(\frac{59-x}{41}+\frac{57-x}{43}+\frac{55-x}{45}+\frac{53-x}{47}+\frac{51-x}{49}=-5\)

\(\Rightarrow\frac{59-x}{41}+1+\frac{57-x}{43}+1+\frac{55-x}{45}+1+\frac{53-x}{47}+1+\frac{51-x}{49}+1\)\(=-5+5\)

\(\Rightarrow\frac{59-x+49}{41}+\frac{57-x+43}{43}+\frac{55-x+45}{45}+\frac{53-x+47}{47}\)\(+\frac{51-x+49}{49}=0\)

\(\Rightarrow\frac{100-x}{41}+\frac{100-x}{43}+\frac{100-x}{45}+\frac{100-x}{47}+\frac{100-x}{49}=0\)

\(\Rightarrow\left(100-x\right)\left(\frac{1}{41}+\frac{1}{43}+\frac{1}{45}+\frac{1}{47}+\frac{1}{49}\right)=0\)

Vì \(\frac{1}{41}+\frac{1}{43}+\frac{1}{45}+\frac{1}{47}+\frac{1}{49}\ne0\)

\(\Rightarrow100-x=0\)

\(\Rightarrow x=100\)

\(=\frac{59-x}{41}+1+\frac{57-x}{43}+1+\frac{55-x}{45}+1+\frac{53-x}{47}+1+\)

\(\frac{51-x}{49}+1=-5+5\)

đoạn này có 5 là do mik mượn 5 con 1 khi đó nha

\(=\frac{100-x}{41}+\frac{100-x}{43}+\frac{100-x}{45}+\frac{100-x}{47}+\)

\(\frac{100-x}{49}=0\)

\(=\left(100-x\right)\left(\frac{1}{41}+\frac{1}{43}+\frac{1}{45}+\frac{1}{47}+\frac{1}{49}\right)=0\)

mà \(\frac{1}{41}+\frac{1}{43}+\frac{1}{45}+\frac{1}{47}+\frac{1}{49}< 0\)

nên 100-x=0 

còn lại bn từ lm