So sánh: A=10^8+2/10^8+1 và B=10^8/10^8-3
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\(A=\frac{10^8+2}{10^8-1}=\frac{10^8-1+3}{10^8-1}=\frac{10^8-1}{10^8-1}+\frac{3}{10^8-1}=1+\frac{3}{10^8-1}\)
\(B=\frac{10^8}{10^8-3}=\frac{10^8-3+3}{10^8-3}=\frac{10^8-3}{10^8-3}+\frac{3}{10^8-3}=1+\frac{3}{10^8-3}\)
Vì 108-1 > 108-3
=>\(\frac{3}{10^8-1}< \frac{3}{10^8-3}\)
=>\(1+\frac{3}{10^8-1}< 1+\frac{3}{10^8-3}\Rightarrow A< B\)
Ta có: A = 108 + 2/ 108 - 1 = 3/108 - 1
B = 108 / 108 - 3 = 3 / 108 -3
Vì 3 / 108 - 1 < 3 / 108 -3 nên
Nên A< B
Mình làm câu a) nha!!!
+) \(A=2009^{2010}+2009^{2009}\)
\(=2009^{2009}.\left(2009+1\right)\)
\(=2009^{2009}.2010\)
+) \(B=2010^{2010}=2010^{2009}.2010\)
Vì \(2010^{2009}>2009^{2009}\)nên \(2010^{2009}.2010>2009^{2009}.2010\)hay \(B>A\)
Vậy \(A< B\)
Hok tốt nha^^
A=10^8+2/10^8-1=10^8-1+3/10^8-1
=10^8-1/10^8-1+3/10^8-1=1+3/10^8-1=1/3/...
B=10^8/10^8-3=10^8-3+3/10^8-3
=10^8-3/10^8-3+3/10^8-3=1+3/10^8-3=1/3/...
tu (1) va (2) =>1/3/10^8-1<1/3/10^8-3(vi phân so nao
co mau be hon thi phân so do lon hon nen 10^8-1>10^8-3)
Hay A<B
k mk nha
\(A=\frac{10^8+2}{10^8-1}=1+\frac{3}{10^8-1}>1+\frac{3}{10^8-3}=\frac{10^8}{10^8-3}=B\)
vậy A>B
Ta có:\(A=\frac{10^8+2}{10^8-1}=\frac{10^8-1+3}{10^8-1}\)
\(\Rightarrow A=\frac{10^8-1}{10^8-1}+\frac{3}{10^8-1}\)
\(\Rightarrow A=1+\frac{3}{10^8-1}\)
\(B=\frac{10^8}{10^8-3}=\frac{10^8-3}{10^8-3}+\frac{3}{10^8-3}\)
\(\Rightarrow B=1+\frac{3}{10^8-3}\)
Vì \(\frac{3}{10^8-1}>\frac{3}{10^8-3}\Rightarrow A>B\)
\(\frac{10^8+2}{10^8-1}=\frac{10^8-1+3}{10^8-1}=1+\frac{3}{10^8-1}\)
\(\frac{10^8}{10^8-3}=\frac{10^8-3+3}{10^8-3}=1+\frac{3}{10^8-3}\)
Ta có: \(\frac{3}{10^8-1}< \frac{3}{10^8-3}\)
\(\Rightarrow1+\frac{3}{10^8-1}< 1+\frac{3}{10^8-3}\)
\(\Rightarrow\frac{10^8+2}{10^8-1}< \frac{10^8}{10^8-3}\)
Ta có:\(\frac{196}{197}+\frac{197}{198}=\left(1-\frac{1}{197}\right)+\left(1-\frac{1}{198}\right)=2-\frac{1}{197}-\frac{1}{198}>2-1=1\)
Mà \(\frac{196+197}{197+198}< \frac{197+198}{197+198}=1\)
\(\Rightarrow\frac{196}{197}+\frac{197}{198}>\frac{196+197}{197+198}\)
c) tương tự câu a
Tham khảo nhé~
Mn ơi giúp mik với ;-;
Tham khảo:https://olm.vn/hoi-dap/tim-kiem?q=+++++++++++So+s%C3%A1nh+A=10%5E8+2/10%5E8-1+v%C3%A0+B=10%5E8/10%5E8-3&id=557026