Question

Tính :

a)  1 1/9 x 3/4 = .........................            b) 2 2/5 x 3 3/4 x 4 2/7 = .....................

    5/6 : 1 1/9 = ...........................                1 1/3 : 2 1/7 : 1 1/15 = .....................

huhu mik cần gấp lắm mn giúp mik với

Answer 1

a)\(1\dfrac{1}{9}x\dfrac{3}{4}\)

\(=\dfrac{10}{9}x\dfrac{3}{4}\)

=\(\dfrac{5}{6}\)

\(\dfrac{5}{6}:1\dfrac{1}{9}\)

=\(\dfrac{5}{6}:\dfrac{10}{9}\)

\(=\dfrac{3}{4}\)

b)\(2\dfrac{2}{5}x3\dfrac{3}{4}x4\dfrac{2}{7}\)

=\(\dfrac{12}{5}x\dfrac{15}{4}x\dfrac{16}{15}\)

\(=9x\dfrac{16}{15}\)

=\(\dfrac{48}{5}\)

=\(1\dfrac{1}{3}:2\dfrac{1}{7}:1\dfrac{1}{15}\)

=\(\dfrac{4}{3}:\dfrac{15}{7}:\dfrac{16}{15}\)

\(=\dfrac{28}{45}:\dfrac{16}{15}\)

=\(\dfrac{7}{12}\)

 

Answer 2

a) = \(\dfrac{10}{9}\)x\(\dfrac{3}{4}\)

= \(\dfrac{5}{6}\)

\(\dfrac{5}{6}\):\(\dfrac{10}{9}\)

= \(\dfrac{5}{6}\)x\(\dfrac{9}{10}\)

= \(\dfrac{3}{4}\)

b) = \(\dfrac{12}{5}\)x\(\dfrac{15}{4}\)x\(\dfrac{30}{7}\)

= \(\dfrac{270}{7}\)

= \(\dfrac{4}{3}\):\(\dfrac{15}{7}\):\(\dfrac{16}{15}\)

= \(\dfrac{7}{12}\)