Question

[2 Nguyễn Thị Quỳnh Anh]

bài 1: viết các phân số thành phân số thập phân \(\dfrac{9}{5};\dfrac{13}{25};\dfrac{27}{300};\dfrac{34}{200};\dfrac{7}{8}\)

bài 2: Tìm \(y\)

a,\(y\) x \(\dfrac{6}{7}\) = \(\dfrac{12}{14}\)       b,\(\dfrac{52}{60}\) x \(y\) = \(\dfrac{4}{15}\)       c,\(y:\dfrac{3}{4}=\dfrac{8}{12}\)       d,\(y:6=\dfrac{13}{18}\)

Answer 1

[Nguyễn Thị Thương Hoài]

bài 1:

\(\dfrac{9}{5}\) = \(\dfrac{9.2}{5.2}\) = \(\dfrac{18}{10}\)

\(\dfrac{13}{25}\) = \(\dfrac{13.4}{25.4}\) = \(\dfrac{52}{100}\)

\(\dfrac{27}{300}\) = \(\dfrac{27:3}{300:3}\) = \(\dfrac{9}{100}\)

\(\dfrac{34}{200}\) = \(\dfrac{34:2}{200:2}\) = \(\dfrac{17}{100}\)

\(\dfrac{7}{8}\) = \(\dfrac{7.125}{8.125}\) = \(\dfrac{875}{1000}\)

bài 2: tìm y 

a, y x \(\dfrac{6}{7}\) = \(\dfrac{12}{14}\)

y = \(\dfrac{12}{14}\): \(\dfrac{6}{7}\)

y = 1

b, \(\dfrac{52}{60}\) x y = \(\dfrac{4}{15}\)

 y = \(\dfrac{4}{15}\): \(\dfrac{52}{60}\)

y = \(\dfrac{4}{13}\) 

c, y: \(\dfrac{3}{4}\) = \(\dfrac{8}{12}\)

   y = \(\dfrac{8}{12}\) x \(\dfrac{3}{4}\)

   y = \(\dfrac{1}{2}\)

d, y : 6 = \(\dfrac{13}{18}\)

    y = \(\dfrac{13}{18}\) x 6

    y = \(\dfrac{13}{3}\)