=1 nha bố

nhớ k và kb đấy nhé 

kết quả = 1

32/15x (15/4+ 15/8)

= 32/15x (30/8+ 15/8)

= 32/15x 45/8

= 12/1

=12

\(\frac{32}{15}\times\left(\frac{15}{4}+\frac{15}{8}\right)=\frac{32}{15}\times\left(\frac{30}{8}+\frac{15}{8}\right)\)

\(=\frac{32}{15}\times\frac{45}{8}=\frac{8\times4\times15\times3}{15\times8}=4\times3=12\)

\(=\left(\frac{4}{17}+\frac{13}{17}\right)-\left(\frac{7}{15}+\frac{8}{15}\right)+\left(\frac{10}{16}-\frac{7}{16}\right)\)

\(=1-1+\frac{3}{16}\)

\(\frac{3}{16}\)

gộp 1,3 

2,4

5,6

thì ra 17/17-15/15+3/16=3/16

hk tốt!

14/15 : 7/5 - 8/15

= 14/15 x 5/7 - 8/15

= 2/3 - 8/15

= 2/15

14/15:7/5-8/15

=14/15x5/7-8/15

=2/3-8/15

=10/15-8/15

=2/15

Chọn A nha bạn

=(8/27+19/27)+(4/15+11/15)

=27/27+15/15

=1+1

=2

\(\frac{8}{27}+\frac{4}{15}+\frac{19}{27}+\frac{11}{15}\)

\(=\left(\frac{8}{27}+\frac{19}{27}\right)+\left(\frac{4}{15}+\frac{11}{15}\right)\)

\(=1+1=2\)

\(\frac{8}{15}:\frac{2}{11}+\frac{7}{15}:\frac{2}{11}\)

\(=\left(\frac{8}{15}+\frac{7}{15}\right):\frac{2}{11}\)

\(=1:\frac{2}{11}\)

\(=\frac{11}{2}\)

   8/15 : 2/11 + 7/15 : 2/11

= (8/15 + 7/15) : 2/11

=       15/15      : 2/11

=          15/15  x  11/2

=                  165/30

\(\frac{19}{15}+\frac{31}{23}-\frac{4}{15}-\frac{8}{23}\)

\(=\left(\frac{19}{15}-\frac{4}{15}\right)+\left(\frac{31}{23}-\frac{8}{23}\right)\)

\(=\frac{15}{15}+\frac{23}{23}\)

\(=1+1=2\)

\(\frac{19}{15}+\frac{31}{23}-\frac{14}{15}-\frac{8}{23}\)

\(=\frac{19}{15}-\frac{4}{15}+\frac{31}{23}-\frac{8}{23}\)

\(=1+1=2\)

chúc bạn học giỏi

bằng 2 nha

17/11 + 17/15 - 6/11 + 18/15 

= ( 17/11 + 6/11 )  - ( 7/15 + 8/15 ) 

= 21/11 - 15/15 

= 21/11 -1 

= 10/11