Question

tính nhanh cho mn

\(3+\dfrac{4}{9}\times\dfrac{7}{25}\times\dfrac{27}{12}\times3\dfrac{4}{7}-\dfrac{7}{25}\)

Answer 1

\(=3+\dfrac{4}{9}\cdot\dfrac{7}{25}\cdot\dfrac{9}{4}\cdot\dfrac{25}{7}=3+\dfrac{4.7.9.25}{9.25.4.7}=3+1=4\)

Answer 2

Answer 3

\(=3+\dfrac{4}{9}\times\dfrac{7}{25}\times\dfrac{9}{4}\times\dfrac{25}{7}-\dfrac{7}{25}\)

\(=3+\dfrac{4.7.9.45}{9.25.4.7}-\dfrac{7}{25}\)

\(=3+1-\dfrac{7}{25}\)

\(=4-\dfrac{7}{25}\)

\(=\dfrac{93}{25}\)

Answer 4

`3 + 4/9 xx 7/25 xx 27/12 xx 3 4/7 - 7/25`

= `3 + 4/9 xx7/25 xx 9/4 xx 25/7 - 7/25`

= `3 + (4 xx 7 xx 9 xx 25)/(9 xx 25 xx 4 xx 7) - 7/25`

= `3 + 6300/6300 - 7/25`

= `3 + 1 -7/25`

=` 4 - 7/25`

= `93/25`