Question

[Lê Ngọc Mỹ Ngân]

Mẫu : Ta có: 5 x 6 x 7 x 9 = 5 x 6 x 7 x 9 = 5/6

                   12  7 x 27        6 x 2 x 7 x 9 x 3

a) 3 x 4 x 7 = 

    12 x 8 x 9

b)4 x 5 x 6 =

  12 x 10 x 8

c)5 x 6 x 7=

   12 x 14 x 15

Ai nhanh nhất TiCk ChO !

Answer 1

[sakura]

\(a,\frac{3\times4\times7}{12\times8\times9}=\frac{3\times4\times7}{3\times4\times2\times4\times3\times3}=\frac{7}{72}\)

\(b,\frac{4\times5\times6}{12\times10\times8}=\frac{2\times2\times5\times3\times2}{4\times3\times5\times2\times4\times2}=\frac{1}{8}\)

\(c,\frac{5\times6\times7}{12\times14\times15}=\frac{5\times3\times2\times7}{4\times3\times7\times2\times5\times3}=\frac{1}{12}\)

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