TL

4/16+1/4=1/4+14=2/4=1/2

b) 15/25+6/10=3/5+3/5=6/5

c)5/9+21/27=5/9+7/9=4/3

HT

\(a)\) \(\dfrac{4}{16} + \dfrac{1}{4} = \dfrac{1}{4}+ \dfrac{1}{4} = \dfrac{2}{4} = \dfrac{1}{2} \)

\(b) \dfrac{15}{25} + + \dfrac{6}{10} = \dfrac{3}{5} + \dfrac{3}{5} =\dfrac{6}{5} \)

\(c) \dfrac{5}{9} + \dfrac{21}{27} = \dfrac{5}{9} + \dfrac{7}{9} = \dfrac{12}{9} = \dfrac{4}{3}\)

a) 1/4 + 1/4 = 2/4 = 1/2

b) 3/5 + 3/5 = 6/5

c) 5/9 + 7/9 = 12/9 = 4/3

a,\(\frac{4}{6}+\frac{18}{27}=\frac{2}{3}+\frac{2}{3}=\frac{4}{3}\)

b,\(\frac{15}{25}+\frac{6}{21}=\frac{3}{5}+\frac{2}{7}=\frac{21}{35}+\frac{10}{35}=\frac{31}{35}\)

a,4/6 = 2/3 ; 18/27 = 2/3 

ta có: 2/3 + 2/3 = 4/3

b,15/25 = 3/5 ; 6/21 = 2/7

ta có: 3/5 + 2/7 = 6/2

Rút gọn 

696+6​/3132+27 

a; \(\dfrac{9}{27}\) + \(\dfrac{7}{-49}\)

= \(\dfrac{1}{3}\) - \(\dfrac{1}{7}\)

= \(\dfrac{7}{21}\) - \(\dfrac{3}{21}\)

= \(\dfrac{4}{21}\)

b; - \(\dfrac{12}{10}\) + \(\dfrac{-25}{30}\)

   =  - \(\dfrac{6}{5}\) - \(\dfrac{5}{6}\)

   = -\(\dfrac{36}{30}\) - \(\dfrac{25}{30}\)

  = \(\dfrac{-61}{30}\) 

c; \(\dfrac{-20}{35}\) + \(\dfrac{-16}{-24}\)

 =  - \(\dfrac{4}{7}\) + \(\dfrac{2}{3}\)

= - \(\dfrac{12}{21}\) + \(\dfrac{14}{21}\)

=  \(\dfrac{2}{21}\)

d; - \(\dfrac{21}{77}\) + \(\dfrac{10}{-35}\)

 = - \(\dfrac{3}{11}\) - \(\dfrac{2}{7}\)

 = - \(\dfrac{21}{77}\) -  \(\dfrac{22}{77}\)

= - \(\dfrac{43}{77}\)

a) 3/5 + 2/5 = 5/5 = 1

b) 4/6 =2/3 ; 18/27 = 2/3

    2/3 + 2/3 = 4/3

c) mình ko biết làm

a) \(\frac{3}{5}+\frac{2}{5}=\frac{3+2}{5}=\frac{5}{5}=1\)

b)\(\frac{4}{6}=\frac{2}{3}\)

\(\frac{18}{27}=\frac{2}{3}\)

\(\frac{2}{3}+\frac{2}{3}=\frac{2+2}{3}=\frac{4}{3}\)

c)\(\frac{15}{25}=\frac{3}{5}\)

\(\frac{6}{21}=\frac{2}{7}\)

\(\frac{3}{5}+\frac{2}{7}=\frac{21}{35}+\frac{10}{35}=\frac{21+10}{35}=\frac{31}{35}\)

b)15/25+6/21=3/5+2/7=31/35 nha bạn

a, \(\frac{5}{16}+\frac{3}{8}=\frac{5}{16}+\frac{6}{16}=\frac{11}{16}\)

b, \(\frac{15}{25}+\frac{6}{21}=\frac{3}{5}+\frac{2}{7}\)

                           \(=\frac{21}{35}+\frac{10}{35}=\frac{31}{35}\)

a) Ta có: \(\frac{5}{16}+\frac{3}{8}=\frac{5}{16}+\frac{6}{16}=\frac{11}{16}\)

b) Ta có: \(\frac{3}{5}+\frac{2}{7}=\frac{21}{35}+\frac{10}{35}=\frac{31}{35}\)

mai mình thi rồi, các bạn giúp mình với

Chờ tí

Câu 4: 

d) Ta có: \(\dfrac{-2}{17}+\dfrac{3}{19}+\dfrac{-15}{17}+\dfrac{16}{19}+\dfrac{5}{6}\)

\(=\left(-\dfrac{2}{17}-\dfrac{15}{17}\right)+\left(\dfrac{3}{19}+\dfrac{16}{19}\right)+\dfrac{5}{6}\)

\(=-1+1+\dfrac{5}{6}=\dfrac{5}{6}\)

rút gọn phân số :

4/5+21/15=4/5+7/5=11/5

8/9-25/45=8/9-5/9=3/9

tính :

5/6+2/7+15/6=5/6+15/6+2/7

=10/3+2/7=76/21

7/8-9/6.7/8=7/8-21/16=-7/16 

chúc bạn học tốt !!!

Rút gọn rồi tính:                                                                                                                                               \(a.\frac{16}{24}-\frac{1}{3}=\frac{2}{3}-\frac{1}{3}=\frac{1}{3}\)

\(b.\frac{4}{5}-\frac{12}{60}=\frac{4}{5}-\frac{1}{5}=\frac{3}{5}\)

Tính rồi rút gọn:

\(a.\frac{17}{6}-\frac{2}{6}=\frac{15}{6}\)

\(b.\frac{16}{15}-\frac{11}{15}=\frac{5}{15}=\frac{1}{3}\)

\(c.\frac{19}{12}-\frac{13}{12}=\frac{6}{12}=\frac{1}{2}\)

1a2/3-1/3=1/3            c4/5-1/5=3/5             tinh roi rut gon 17/6-2/6=15/6=5/2             16/15-11/15=5/15=1/3           19/12-13/12=6/12=1/2

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