Question

1.Tính:

a) 2/7 + 5/3                                                             b) 49 + 5(số 5 ở giữa dòng)

c)4/7 x 5/8                                                              d) ¼ x 5/6 x 7/3

2.Tính bằng 2 cách

a. ( 3/5 + ½) x 4/5                                                        a. ( 3/5 + ½) x 4/5

 

 b. 2/5 x 3/7 + 2/5 x 4/7                                             b. 2/5 x 3/7 + 2/5 x 4/7

3. Tìm x:

X + 3/8 = 14/9 x 10/35                                                 x – 2/7= 21/10 x 15/28

 

11/7 – x = 8/3 x 9/32                                                     2/5 + x = 12/35 x 14/9

 

Answer 1

trong sách giáo khoa hả

Answer 2

hnay mik cg hc 

Answer 3

Bài 3: 

a: x+3/8=14/9x10/35

\(\Leftrightarrow x+\dfrac{3}{8}=\dfrac{4}{9}\)

=>x=4/9-3/8=32/72-27/72=5/72

b: \(x-\dfrac{2}{7}=\dfrac{21}{10}\cdot\dfrac{15}{28}=\dfrac{21}{28}\cdot\dfrac{15}{10}=\dfrac{3}{4}\cdot\dfrac{3}{2}=\dfrac{9}{8}\)

\(\Leftrightarrow x=\dfrac{9}{8}+\dfrac{2}{7}=\dfrac{63}{56}+\dfrac{16}{56}=\dfrac{79}{56}\)

c: \(\dfrac{11}{7}-x=\dfrac{8}{3}\cdot\dfrac{9}{32}=\dfrac{1}{4}\cdot3=\dfrac{3}{4}\)

nên \(x=\dfrac{11}{7}-\dfrac{3}{4}=\dfrac{44}{28}-\dfrac{21}{28}=\dfrac{23}{28}\)

d: \(x+\dfrac{2}{5}=\dfrac{12}{35}\cdot\dfrac{14}{9}=\dfrac{4}{3}\cdot\dfrac{2}{5}=\dfrac{8}{15}\)

nên \(x=\dfrac{8}{15}-\dfrac{2}{5}=\dfrac{8}{15}-\dfrac{10}{15}=-\dfrac{2}{15}\)