Question

So sánh:

\(A=\frac{3}{8^3}+\frac{7}{8^4}\) và \(B=\frac{7}{8^3}+\frac{3}{8^4}\)

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Answer 1

ta co :  A = 3/8^3+3/8^4+4/8^4

           B=3/8^3+3/8^4+4/8^3

VI 4/8^4 <4/8^3 NEN A<B

Answer 2

có \(\frac{3}{8^3}+\frac{7}{8^4}=\frac{3}{8^3}+\frac{3}{8^4}+\frac{4}{8^4}\)

    \(\frac{7}{8^3}+\frac{3}{8^4}=\frac{3}{8^3}+\frac{4}{8^3}+\frac{3}{8^4}\)

vì \(\frac{4}{8^4}

Answer 3

Ta có:

=> A= 3/8 ^ 3+3/8 ^ 4 + 4/8^4

B= 3/8 ^ 3 = 38 ^4 +4/8^3

Vậy:

A/8^4<4/8^3

Nên A <B