Bài 1 

a,=17/20

b,=.13/6

c,=5/3

d,=6/5

Bài 2

a=37/7

b=43/9

c=82/11

d=76/21

CHO MÌNH CÂU TRẢ LỜI HAY NHẤT NHA BẠN

Bài 1:

a) $\frac{1}{4}$ + $\frac{3}{5}$ = $\frac{5}{20}$ + $\frac{12}{20}$ = $\frac{17}{20}$

b) $\frac{3}{2}$ + $\frac{2}{3}$ = $\frac{9}{6}$ + $\frac{4}{6}$ = $\frac{13}{6}$

c) $\frac{5}{6}$ + $\frac{15}{18}$ = $\frac{15}{18}$ + $\frac{15}{18}$ = $\frac{30}{18}$ = $\frac{5}{3}$

d) $\frac{8}{15}$ + $\frac{2}{3}$ = $\frac{8}{15}$ + $\frac{10}{15}$ = $\frac{18}{15}$ = $\frac{6}{5}$

Bài 2:

a) 5 + $\frac{2}{7}$ = $\frac{35}{7}$ + $\frac{2}{7}$ = $\frac{37}{7}$

b) 4 + $\frac{7}{9}$ = $\frac{36}{9}$ + $\frac{7}{9}$ = $\frac{43}{9}$

c) $\frac{5}{11}$ + 7 = $\frac{5}{11}$ + $\frac{77}{11}$ = $\frac{82}{11}$

d) $\frac{13}{21}$ + 3 = $\frac{13}{21}$ + $\frac{63}{21}$ = $\frac{76}{21}$

học tốt