Question

A) \(\dfrac{1}{3}\)+ 25% . 4 -\(\dfrac{1}{2}\)

B) \(\dfrac{5}{7}\) .\(\dfrac{1}{15}\) + \(\dfrac{5}{7}\) - \(\dfrac{5}{7}\) . \(\dfrac{3}{15}\)

Answer 1

a) \(=\dfrac{1}{3}+\dfrac{1}{4}.4-\dfrac{1}{2}=\dfrac{4}{3}-\dfrac{1}{2}=\dfrac{8}{6}-\dfrac{3}{6}=\dfrac{5}{6}\)

Answer 2

a)1/3+25%.4-1/2

= 1/3+1/4.4-1/2

=1/3+1-1/2

=5/6

b)5/7.1/15+5/7-5/7.3/15

=5/7.(1/15-3/15)+5/7

=5/7.(-2/15)+5/7

=-2/21+5/7

=13/21

 

Answer 3

a,=1/3+1/4.4-1/2

=1/3+1-1/2

=4/3-1/2

=5/6

Answer 4

b,=5/7.(1/15+1-3/15)

=5/7.13/15

=13/21

Answer 5

\(a\)) \(\dfrac{1}{3}\) \(+25\%\) . \(4-\dfrac{1}{2}\) 

  \(=\) \(\dfrac{1}{3}\) \(+\dfrac{1}{4}\) . \(4-\dfrac{1}{2}\) 

   \(=\)  \(\dfrac{1}{3}\) \(+1-\dfrac{1}{2}\) 

    \(=\dfrac{4}{3}-\dfrac{1}{2}\) \(=\)  \(\dfrac{5}{6}\)

\(b\)) \(\dfrac{5}{7}.\dfrac{1}{15}+\dfrac{5}{7}-\dfrac{5}{7}.\dfrac{3}{15}\) 

 \(=\dfrac{5}{7}.\left(\dfrac{1}{15}-\dfrac{3}{15}\right)-\dfrac{5}{7}\) 

 \(=\dfrac{5}{7}.\left(-\dfrac{2}{15}\right)-\dfrac{5}{7}\) \(=-\dfrac{2}{21}-\dfrac{5}{7}=\dfrac{13}{21}\)

Answer 6

Giải:

a) \(\dfrac{1}{3}+25\%.4-\dfrac{1}{2}=\dfrac{1}{3}+1-\dfrac{1}{2}=\dfrac{2}{6}+\dfrac{6}{6}-\dfrac{3}{6}=\dfrac{2+6-3}{6}=\dfrac{5}{6}\) 

b) \(\dfrac{5}{7}.\dfrac{1}{15}+\dfrac{5}{7}-\dfrac{5}{7}.\dfrac{3}{15}\) 

\(=\dfrac{5}{7}.\left(\dfrac{1}{15}+1-\dfrac{3}{15}\right)\) 

\(=\dfrac{5}{7}.\dfrac{13}{15}\) 

\(=\dfrac{13}{21}\)

Answer 7

a)1/3+25%.4-1/2

= 1/3+1/4.4-1/2

=1/3+1-1/2

=5/6

b)5/7.1/15+5/7-5/7.3/15

=5/7.(1/15-3/15)+5/7

=5/7.(-2/15)+5/7

=-2/21+5/7

=13/21