( 2010/2017 + 6/2017 + 1/2017 ) : 1/2

= 2017/2017 : 1/2 

= 1

125 x 12 + 12 x 874 + 12

=       ( 125 + 874 + 1 ) x 12

=            1000  x  12

=             12 000

12- ( 12 - 9,36 ) 

= 9,36 - ( 12 - 12 )

= 9,36 - 0

= 9,36

=12-12+9,36

=0+9,36

=9,36

=125 x 12 +12 x 874 +12 x 1

=12x( 125 + 874 +1)

=12 x 1000

=12000

=12.(125+874+1)

=12.1000

=12000

125 x 12 + 12 x 874 + 12

= 12 x ( 125 + 874 + 1 )

= 12 x 1000

= 12000

\(\dfrac{5}{12}+\dfrac{8}{12}+\dfrac{7}{12}+\dfrac{4}{12}=\dfrac{5+8+7+4}{12}=\dfrac{24}{12}=2\)

sai

nhầm đúng

\(\frac{8}{14}+\frac{5}{12}+\frac{6}{14}+\frac{8}{12}-\frac{1}{12}\)

\(=\left(\frac{8}{14}+\frac{6}{14}\right)+\left(\frac{5}{12}+\frac{8}{12}-\frac{1}{12}\right)\)

\(=1+1=2\)

\(\frac{8}{14}+\frac{5}{12}+\frac{6}{14}+\frac{8}{12}-\frac{1}{12}\)

\(=\left(\frac{8}{14}+\frac{6}{14}\right)+\left(\frac{5}{12}+\frac{8}{12}-\frac{1}{12}\right)\)

\(=1+1=2\)

~ Hok tốt ~

\(\frac{8}{14}+\frac{5}{12}+\frac{6}{14}+\frac{8}{12}-\frac{1}{12}\)

\(=\left(\frac{8}{14}+\frac{6}{14}\right)+\left(\frac{5}{12}+\frac{8}{12}-\frac{1}{12}\right)\)

\(=1+1\)

\(=2\)

= 2/5 +(7/12 + 13/12)

=2/5 + 20/12

=   31/15

Giống Nguyễn thị sương quỳnh

7/13 < 13/ < 7/12

\(\frac{14}{9}:\frac{13}{12}+\frac{4}{3}:\frac{13}{12}\)

\(=\frac{14}{9}\cdot\frac{12}{13}+\frac{4}{3}\cdot\frac{12}{13}\)

\(=\left(\frac{14}{9}+\frac{4}{3}\right)\cdot\frac{12}{13}\)

\(=\frac{26}{9}\cdot\frac{12}{13}=\frac{8}{3}\)

\(=\dfrac{11}{12}\left(\dfrac{2}{7}+\dfrac{4}{7}+\dfrac{1}{7}\right)=\dfrac{11}{12}\cdot1=\dfrac{11}{12}\)

=11/12

11/12 nha