a) 3/5:3/4=3/5x4/3=(3x4)/(5x3)=12/15=4/5

b)2/5:3/10=2/5x10/3=(2x10)/(5x3)=20/15=4/3

c)9/8:3/4=9/8x4/3=(9x4)/(8x3)=36/32=9/8

d)1/4:1/2=1/4x2=2/4=1/2

e)1/8:1/6=1/8x6=6/8=3/4

g)1/5:1/10=1/5x10=10/5=2

a) 3/5 : 3/4 = 4/5

b) 2/5 : 3/10 = 4/3

c) 9/8 : 3/4 = 3/2

d)  1/4 : 1/2 = 1/2

e) 1/8 : 1/6 = 3/4

g) 1/5 : 1/10 = 2

tk tớ nha

a)3/5:3/4=3/5x4/3=12/15=4/5

b)2/5:3/10=2/5x10/3=20/15=5/3

c)9/8:3/4=9/8x4/3=36/24=3/2

d)1/4:1/2=1/4x2=1/2

e)1/8:1/6=1/8x6=3/4

g)1/5:1/10=1/5x10=2

\(a,\frac{2}{7}:\frac{4}{5}=\frac{2}{7}\times\frac{5}{4}=\frac{10}{28}=\frac{5}{14}\)

\(b,\frac{3}{8}:\frac{9}{4}=\frac{3}{8}\times\frac{4}{9}=\frac{12}{72}=\frac{1}{6}\)

\(c,\frac{8}{21}:\frac{4}{7}=\frac{8}{21}\times\frac{7}{4}=\frac{56}{84}=\frac{2}{3}\)

\(d,\frac{5}{8}:\frac{15}{8}=\frac{5}{8}\times\frac{8}{15}=\frac{40}{120}=\frac{1}{3}\)

A,\(\frac{2}{7}:\frac{4}{5}=\frac{2}{7}\times\frac{5}{4}=\frac{10}{28}=\frac{5}{14}\)

B,\(\frac{3}{8}:\frac{9}{4}=\frac{3}{8}\times\frac{4}{9}=\frac{12}{72}=\frac{1}{6}\)

C.\(\frac{8}{21}:\frac{4}{7}=\frac{8}{21}\times\frac{7}{4}=\frac{56}{84}=\frac{2}{3}\)

D.\(\frac{5}{8}:\frac{15}{8}=\frac{5}{8}\times\frac{8}{15}=\frac{40}{120}=\frac{1}{3}\)

Đúng 100%

a, \(\frac{2}{7}:\frac{4}{5}=\)\(\frac{2}{7}x\)\(\frac{5}{4}\)\(\frac{10}{28}=\frac{5}{14}\)

b,\(\frac{3}{8}:\frac{9}{4}\)\(=\frac{3}{8}x\)\(\frac{4}{9}\)\(=\frac{12}{72}=\frac{1}{6}\)

c,\(\frac{8}{21}:\frac{4}{7}\)\(=\frac{8}{21}x\)\(\frac{7}{4}\)\(=\frac{56}{84}=\frac{2}{3}\)

d,\(\frac{5}{8}:\frac{15}{8}\)\(\frac{5}{8}x\)\(\frac{8}{15}=\frac{40}{120}=\frac{1}{3}\)

tk giup mk nha

A)2/7:4/5=2/7*5/4=10/28=5/14

b)3/8:9/4=3/8*4/9=12/72=1/6

c)8/21:4/7=8/21*7/4=56/84=2/3

D)5/8:15/8=5/8*8/15=40/120=1/3

k nha

a) \(3:\frac{6}{7}=3\times\frac{7}{6}=\frac{21}{6}\)

b) \(\frac{5}{9}:5=\frac{5}{9}:\frac{5}{1}=\frac{5}{9}\times\frac{1}{5}=\frac{5}{45}=\frac{1}{9}\)

c) \(5:\frac{20}{21}=5\times\frac{21}{20}=\frac{105}{20}=\frac{21}{4}\)

d) \(\frac{3}{7}:9=\frac{3}{7}:\frac{9}{1}=\frac{3}{7}\times\frac{1}{9}=\frac{3}{63}=\frac{1}{21}\)

ủng hộ tớ nha

3:6/7=3x7/6=21/6

5/9:5=5/9x1/5=(5)/(9x5)=5/45=1/9

5:20/21=5x21/20=105/20=21/4

3/7:9=3/7x1/9=(3)/(7x9)=3/63=1/21

k minh nha

a, 3/1/2

b, 2/7/9

c. 5/1/4

d, 1/21

a=3/4*7/6=1/2+1/3=5/6

b=5/3*9/15=1-1/5=4/5

c=1/4*1/5=1/20:1/3=3/20

d=7/9:14/15=5/6*1/2=5/12

A. C1: (6/11 + 5/11) x 3/7 = 1 x 3/7 = 3/7

C2: (6/11 + 5/11) x 3/7 = 6/11 x 3/7 + 5/11 x 3/7 = 18/77 + 15/77 = 3/7

a)Cách 1:

(6/11+5/11)x3/7

=11/11x3/7

=1x3/7

=3/7

Cách 2:

(6/11+5/11)x3/7

=6/11x3/7+5/11x3/7

=18/77    +    15/77

=33/77

=3/7 (mink đã rút gọn)

k nhé

CHẤM PHẨY LÀ GÌ

a)3/5:3/4=12/15=4/5

2/5:3/10=20/15=4/3

9/8:3/4= 32/24=4/3

b)1/4:1/2=2/4=1/2

1/8:1/6=6/8=3/4

1/5:1/10=10/5=2/1=2

kích cho mình nha

giúp mình với được ko ạh

giúp mình đi được ko, mình đang cần gấp

Bài 2: So sánh các phân số sau

7/15 > 5/13              11/12 > 7/48        24/35 > 21/7           15/26 > 7/8

Độ dài đáy hình đó là:

       2/5 : 2/5 = 1 (m)

                    Đáp số: 1 m

k cho mình nhé!!! ^-^

2/5m2=40 dm2

2/5m=4dm

 độ dài đày hình đó

40:4=10 (dm)

10dm=1m 

đáp số 1 m

k minh nha

Độ dài đáy của hình đó là:

      2/5:2/5=1(mét vuông)

                Đ/S:1 mét vuông