\(=\left(\dfrac{5}{6}+\dfrac{7}{6}\right)+\left(\dfrac{4}{15}+\dfrac{11}{15}\right)=\dfrac{12}{6}+1=2+1=3\)

=(5/6+7/6)+(4/15+11/15)

=12/6+15/15

=2+1

=3

\(\frac{11}{15}\cdot\frac{6}{7}+\frac{11}{15}\cdot\frac{8}{7}\) 

\(=\frac{11}{15}\cdot\left(\frac{6}{7}+\frac{8}{7}\right)\) 

\(=\frac{11}{15}\cdot2=\frac{22}{15}\)

Chú ý dấu "  \(\cdot\) " là dấu nhân

      11/15 x 6/7 + 11/15 x 8/7 

=    11/15 x (6/7 + 8/7)

=     11/15 x 2

=      22/15.

Mik ko chắc lắm nhé !

= 11/11+ 15/15

= 1+ 1

= 2

= 11/11+ 15/15

= 1+ 1

= 2

tick cho mk

=11/6*(15/23-7/23)
=11/6*8/23
=44/69
chúc bn hk tốt

\(\frac{11}{6}\times\frac{15}{23}-\frac{11}{6}\times\frac{7}{23}\)=  \(\frac{11}{6}\times\left(\frac{15}{23}-\frac{7}{23}\right)\)

                                                       =\(\frac{11}{6}\times\frac{8}{23}\)

                                                       =  \(\frac{44}{69}\)

14/15 + 6/11 + 1/15 + 5/11 + 22/11

=(14/15 +1/15)+(6/11 + 5/11 + 22/11)

=1+3

=4

 a,  \(\dfrac{5\times11\times15\times18}{6\times15\times22\times10}\)

= \(\dfrac{5\times11\times15\times6\times3}{6\times15\times11\times2\times2\times5}\)

= \(\dfrac{5\times11\times15\times6}{5\times11\times15\times6}\) \(\times\) \(\dfrac{3}{2\times2}\)

= 1 \(\times\) \(\dfrac{3}{4}\)

= \(\dfrac{3}{4}\)

b, \(\dfrac{7}{12}\) \(\times\) \(\dfrac{3}{5}\) + \(\dfrac{3}{5}\) \(\times\) \(\dfrac{5}{12}\)

= \(\dfrac{3}{5}\) \(\times\) ( \(\dfrac{7}{12}+\dfrac{5}{12}\))

= \(\dfrac{3}{5}\) \(\times\) \(\dfrac{12}{12}\)

= \(\dfrac{3}{5}\) \(\times\) 1 

= \(\dfrac{3}{5}\)

( 6 x 8 – 48) : ( 10 + 11 + 12 + 13 + 14 + 15 )

= (48 – 48) : ( 10 + 11 + 12 + 13 + 14 + 15 )

= 0 : ( 10 + 11 + 12 + 13 + 14 + 15 )

= 0

câu trả lời là 0

Câu 2:Đáp số là 8/17 nhé

(5/9+4/9)x8/17

=>1x8/17=8/17

Câu 1: Tìm x:

a)  2/5× x =(thiếu đề)

 8/7: x =4/5 

x=8/7:4/5

x=10/7

Câu 2: Tính bằng cách thuận tiện nhất

5/9× 8/17 + 4/9 × 8/17

=(5/9+4/9)x8/17

=1x8/17=8/17