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

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

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

= 32/15x 45/8

= 12/1

=12

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

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

\(\frac{9}{11}\)< \(\frac{13}{15}\)

\(\frac{19}{15}\)<    \(\frac{15}{11}\)

a) 18/15 + 7/15+12/15 = 18/15 + 12/15 +7/15

                                    =         30/15+ 7/15

                                    =           37/15

b) 9/7+8/7 + 11/7 =   9/7 + 11/7 + 8/7

                             =       20/7 + 8/7

                             =            28/7

a) \(\frac{18}{15}+\frac{7}{15}+\frac{12}{15}=\frac{18}{15}+\frac{12}{15}+\frac{7}{15}=\frac{30}{15}+\frac{7}{15}\)\(=\frac{37}{15}\)

b)\(\frac{9}{7}+\frac{8}{7}+\frac{11}{7}=\frac{9}{7}+\frac{11}{7}+\frac{8}{7}=\)\(\frac{20}{7}+\frac{8}{7}=\frac{28}{7}\)

1/3 + 3/2

= 2/6 + 9/6

= 11/6

\(\frac{1}{15}+\frac{4}{15}+\frac{5}{18}+\frac{7}{18}\)

\(=\left(\frac{1}{15}+\frac{4}{15}\right)+\left(\frac{5}{18}+\frac{7}{18}\right)\)

\(=\frac{5}{15}+\frac{12}{18}\)

\(=\frac13+\frac23\)

\(=\frac33=1\)

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

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

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

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

   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

x = 1 hoặc 0 

tick đi bạn

Bằng \(\frac{200}{3}\)

kết quả bằng 200/3