Question

So sánh : \(A=\frac{1946}{1986}\) và   \(B=\frac{1968}{2008}\)

Answer 1

ta có \(A=\frac{1946}{1986}\)

    \(\Rightarrow1-A=1-\frac{1946}{1986}=\frac{1986}{1986}-\frac{1946}{1986}=\frac{40}{1986}\)

  \(\Rightarrow1-B=1-\frac{1968}{2008}=\frac{2008}{2008}-\frac{1968}{2008}=\frac{40}{2008}\)

                 Vì \(\frac{40}{1986}>\frac{40}{2008}\Rightarrow1-\frac{1946}{1986}>1-\frac{1968}{2008}\)

                       nên    \(\Rightarrow1-A>1-B\left(1\right)\)

                       từ (1) <=> A<B

Answer 2

\(A< B\)vì \(\frac{1946}{1986}< \frac{1968}{2008}\)

Answer 3

vì 1 - A = 40​​

              1986

1 - B =  40 

            2008

ta có : 1 - A > 1 - B 

nên  A < B

Answer 4

cho tớ hỏi A=40/1986 > B=40/2008 nên suy ra:

A > B

Answer 5

1/A = 1986/1946 = (1946 +40)/1946 = 1 + 40/1946 
1/B = 2008/1968 = (1968 +40)/1968 = 1 + 40/1968 

Do 40/1946 > 40/1968 

=> 1/A > 1/B 
=> A < B