Question

bài 1:tính

a).2/3+5/4                      b).3/5+9/8                 c).3/4-2/7

ai nhanh và ghi rõ cách làm mình ms tích nhé

đứa nào ko ghi đừng đòi mình tick

Answer 1

\(a.\frac{2}{3}+\frac{5}{4}=\frac{8}{12}+\frac{15}{12}=\frac{23}{12}\)

\(b.\frac{3}{5}+\frac{9}{8}=\frac{24}{40}+\frac{45}{40}=\frac{69}{40}\)

\(c.\frac{3}{4}-\frac{2}{7}=\frac{21}{28}-\frac{8}{28}=\frac{13}{28}\)

Answer 2

A) 2/3+5/4

= 8/12+15/12

=23/12

B) 3/5+9/8

= 24/40+45/40

=69/40

C)3/4-2/7

= 21/28-8/28

=     13/28

k mink nha mink nhanh nhất

Answer 3

a) 2/3+5/4

=8/12+15/12

=23/12

b)3/5+9/8

=24/40+45/40

=69/40

c)3/4-2/7

=21/28-8/28

=13/28

ok k nhé

Answer 4

\(a,\frac{2}{3}+\frac{5}{4}\)

\(=\frac{8}{12}+\frac{15}{12}\)

\(=\frac{23}{12}\)

\(b,\frac{3}{5}+\frac{9}{8}\)

\(=\frac{24}{40}+\frac{45}{40}\)

\(=\frac{69}{40}\)

\(c,\frac{3}{4}-\frac{2}{7}\)

\(=\frac{21}{28}-\frac{8}{28}\)

\(=\frac{13}{28}\)

Answer 5

23/12;69/40;13/28