8/15+2/3=18/15

3/7+4/8=52/56=13/14

duyet nha dung 1000000000%

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

\(\frac{3}{7}+\frac{4}{8}=\frac{24}{56}+\frac{28}{56}=\frac{52}{56}=\frac{13}{14}\)

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

\(\frac{3}{7}+\frac{4}{8}=\frac{24}{56}+\frac{21}{56}=\frac{45}{56}\)

A)2/3=10/15

8/15+10/15=18/15=9/5

B)3/7=24/56

4/8=28/56

24/56+28/56=13/14

\(\frac{8}{15}+\frac{2}{3}=\frac{8}{15}+\frac{10}{15}=\frac{6}{5}\)

\(\frac{3}{7}+\frac{4}{8}=\frac{24}{56}+\frac{28}{56}=\frac{13}{14}\)

a 1,2

b 13/14

a 18/15 b 45/56 dung thi tk minh nha

1, Rút gọn rồi tính 

a) \(\frac{4}{5}+\frac{3}{15}\)

= \(\frac{4}{5}+\frac{1}{5}\)

= \(\frac{5}{5}\)

= \(1\)

b) \(\frac{2}{3}+\frac{32}{24}\)

= \(\frac{2}{3}+\frac{4}{3}\)

= \(\frac{6}{3}\)

= \(2\)

c) \(\frac{5}{6}+\frac{15}{18}\)

= \(\frac{5}{6}+\frac{5}{6}\)

= \(\frac{10}{6}\)

= \(\frac{5}{3}\)

2, Tính rồi rút gọn 

a) \(\frac{8}{15}+\frac{2}{3}\)

= \(\frac{8}{15}+\frac{10}{15}\)

= \(\frac{18}{15}\)

= \(\frac{6}{5}\)

b) \(\frac{3}{7}+\frac{4}{8}\)

= \(\frac{24}{56}+\frac{28}{56}\)

= \(\frac{52}{56}\)

= \(\frac{13}{14}\)

Đáp án:

a) 1

b) 2

c) 5/3

Bài 3.Tính rồi rút gọn

a)6/5

b) 13/14

a) 4/5+3/15=4/5+1/5=1

b) 2/3+32/24=2/3+4/3=2

c)5/6+15/18=5/6+5/6=5/3

3.

a)8/15+2/3=18/15=6/5

b)3/7+4/8=52/56=13/14

Nhớ k cho mình đó !

Đã hứa thì phải làm

a) 8/15+2/15=8/15+(2x5)/(3x5)

=8/15+10/15=(8+10)/15

=18/15=(18/3)/(15/3)=6/5

b)3/7+4/8=(3x8)/(7x8)+(4x7)/(8x7)

=24/56+28/56=(24+28)/56

=52/56=(52/4)/(56/4)=13/14

a) 8/15+2/3=8/15+10/15=18/15=6/5

b) 3/7+4/8=24/56+28/56=52/56=13/14

a6/5 

b,13/14

8/15 cộng 2/3=8/15 cộng 10/15 = 18/15=6/5

làm sao để ra 6/5 vậy ạ

TL

\(\frac{2}{3}-\frac{3}{9}=\frac{2}{3}-\frac{1}{3}=\frac{1}{3}\)

\(\frac{7}{5}-\frac{15}{25}=\frac{7}{5}-\frac{3}{5}=\frac{4}{5}\)

\(\frac{3}{2}-\frac{4}{8}=\frac{3}{2}-\frac{1}{2}=\frac{2}{2}\)

nhé

thank you cáo nha

2/7 / 1/7 = 10/28 = 5/14

3/8 / 9/4 = 12/72 = 2/12

8/21 / 4/7 = 56/84 = 14/21

5/8 / 15 / 8 = 1/24 / 8 = 1/192