3 + 1 + 6 = 4 + 6 = 10                                                            

8 – 4 – 3 = 4 – 3 = 1

9 – 1 – 3 = 8 – 3 = 5                                                               

3 + 4 + 2 = 7 + 2 = 9

\(=\left(3-8+\dfrac{1}{2}-\dfrac{1}{2}\right)-\left(\dfrac{4}{5}+\dfrac{1}{5}\right)-1\)

\(=-5-1-1=-7\)

77/45

7/6

29/10

\(\dfrac{3}{5}+\dfrac{4}{3}\times\dfrac{5}{6}=\dfrac{3}{5}+\dfrac{10}{9}=\dfrac{27}{45}+\dfrac{50}{45}=\dfrac{77}{45}\)

\(2-\dfrac{7}{6}+\dfrac{1}{3}=\dfrac{12}{6}-\dfrac{7}{6}+\dfrac{2}{6}=\dfrac{7}{6}\)

\(\dfrac{7}{6}\times3-\dfrac{3}{5}=\dfrac{7}{2}-\dfrac{3}{5}=\dfrac{35}{10}-\dfrac{6}{10}=\dfrac{29}{10}\)

giải chi tiết đi

\(\dfrac{3}{4}+\dfrac{1}{4}\times\dfrac{2}{5}-\dfrac{1}{2}\\ =\dfrac{3}{4}+\dfrac{1}{10}-\dfrac{1}{2}\\ =\dfrac{15}{20}+\dfrac{2}{20}-\dfrac{10}{20}\\ =\dfrac{15-10+2}{2}\\ =\dfrac{7}{2}\)

\(\dfrac{3}{4}\times\dfrac{5}{7}=\dfrac{15}{28};\dfrac{5}{8}\times\dfrac{4}{15}=\dfrac{20}{120}=\dfrac{1}{6};\dfrac{7}{12}\times\dfrac{4}{9}=\dfrac{28}{108}=\dfrac{7}{27};\)

\(\dfrac{1}{6}\times\dfrac{3}{5}=\dfrac{3}{30}=\dfrac{1}{10};\dfrac{12}{21}\times\dfrac{23}{8}=\dfrac{276}{168}=\dfrac{23}{14};\dfrac{13}{4}\times\dfrac{5}{39}=\dfrac{65}{156}=\dfrac{5}{12}\)

\(\dfrac{7}{42}\times\dfrac{13}{21}=\dfrac{91}{882}=\dfrac{13}{126};\dfrac{3}{16}\times\dfrac{4}{15}=\dfrac{12}{240}=\dfrac{1}{20}\)

a: =1/2+3/2=2

b: =2/5+7/5=9/5

c: =2/3+2/3=4/3

ai trả lời cho mình vs sos

3/6 + 12/8 = 1/2 + 3/2 = 4/2 = 2

2/5 + 56/40 = 2/5 + 7/5 = 9/5

4/6 + 16/24 = 2/3 + 2/3 = 4/3

?????????

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