\(=\dfrac{-15}{4}.\dfrac{9}{11}+\dfrac{15}{4}.\dfrac{15}{11}-\dfrac{15}{4}.\dfrac{6}{11}\)

= \(\dfrac{15}{4}.\dfrac{-9}{11}+\dfrac{15}{4}.\dfrac{15}{11}-\dfrac{15}{4}.\dfrac{6}{11}\)

= \(\dfrac{15}{4}.\left(\dfrac{-9}{11}+\dfrac{15}{11}-\dfrac{6}{11}\right)\)

= \(\dfrac{15}{4}.\left(\dfrac{6}{11}-\dfrac{6}{11}\right)\)

= \(\dfrac{15}{4}.\left(\dfrac{0}{11}\right)\)

= \(\dfrac{15}{4}.0\)

= 0

=15/4*(-9/11+15/11-6/11)

=15/4*0=0

= \(\dfrac{11}{15}\). \(\left(\dfrac{4}{11}+\dfrac{5}{11}+\dfrac{2}{11}\right)\)

= \(\dfrac{11}{15}\). 1

=\(\dfrac{11}{15}\)

\(=\dfrac{11}{15}\cdot\left(\dfrac{4}{11}+\dfrac{5}{11}+\dfrac{2}{11}\right)=\dfrac{11}{15}\cdot\dfrac{11}{11}=\dfrac{11}{15}\)

11/15 . ( 4/11 +5/11 + 2/11 )

= 11/15 . 1

= 11/15

\(\frac{17}{8}+\frac{28}{15}-\frac{8}{15}=\frac{17}{8}+\frac{4}{3}=\frac{83}{24}=3\frac{11}{24}\)

=> chọn a

Đáp án : a) 311/24

\(=\dfrac{12}{15}\times\left(\dfrac{26}{11}-\dfrac{9}{11}-\dfrac{6}{11}\right)=\dfrac{12}{15}\times\dfrac{11}{11}=\dfrac{12}{15}=\dfrac{4}{5}\)

= 12/15 x (26/11 - 9/11 - 6/11)

= 12/15 x 11/11

= 12/15

help

B. 29/10

B

\(B.\dfrac{29}{10}\)

cái này ra lẻ bạn ah

mik ghi p/s nhé

là 15 phần 28

là bao nhiêu vậy bạn