Question

1.tinh

a,2/5 + 2/3 + 3/4                  b, 1/3 + 5/12 + 5/6                c, 1/6 + 5/24 + 2/3

2 . tim x

a, x + 4/5 = 4/5 (  3/7 + 3/5 )                                   b, 5/7 + x/35 = 4/5

Answer 1

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

\(=\frac{24}{60}+\frac{40}{60}+\frac{45}{60}\)

\(=\frac{24+40+45}{60}\)

\(=\frac{109}{60}\)

Answer 2

1. tính

a) \(\frac{2}{5}+\frac{2}{3}+\frac{3}{4}=\frac{24}{60}+\frac{40}{60}+\frac{45}{60}=\frac{64}{60}+\frac{45}{60}=\frac{109}{60}\)

b) \(\frac{1}{3}+\frac{5}{12}+\frac{5}{6}=\frac{4}{12}+\frac{5}{12}+\frac{10}{12}=\frac{9}{12}+\frac{10}{12}=\frac{19}{12}\)

c) \(\frac{1}{6}+\frac{5}{24}+\frac{2}{3}=\frac{4}{24}+\frac{5}{24}+\frac{16}{24}=\frac{9}{24}+\frac{16}{24}=\frac{25}{24}\)

Answer 3

Toán lớp 4 chưa học cái này mà bn

Answer 4

lam bai 2 voi cac bn