hong ai giúp mik dọ? ;-;

`3/7xx14/5+32/5xx3/7+3/7xx9/5`

`=3/7xx(14/5+32/5+9/5)`

`=3/7xx55/5`

`=3/7xx5`

`=15/7`

\(=\frac{3}{7}\times[\frac{14}{5}+\frac{32}{5}+\frac{9}{5}]=\frac{3}{7}\times\frac{55}{5}=\frac{3}{7}\times11=\frac{33}{7}\)

a) = 3.50793650794

b) = 7.35238095238

tui lười viết lắm nên tui chỉ tính ra kết quả thui

\(\dfrac{3}{4}\times\dfrac{4}{5}+\dfrac{5}{6}\times\dfrac{6}{7}\times\dfrac{7}{8}\)
\(=\dfrac{3}{5}+\dfrac{5}{8}\)
\(=\dfrac{24}{40}+\dfrac{25}{40}\)
\(=\dfrac{49}{40}\)
#Đang Bận Thở

\(\dfrac{3}{4}\times\dfrac{4}{5}\times\dfrac{5}{6}\times\dfrac{6}{7}\div\dfrac{1}{7}\)

\(=\dfrac{3}{4}\times\dfrac{4}{5}\times\dfrac{5}{6}\times\dfrac{6}{7}\times\dfrac{7}{1}\)

\(=\dfrac{3\times4\times5\times6\times7}{4\times5\times6\times7\times1}\)

\(=\dfrac{3}{1}=3\)

a) = 1.1204
b) = 0.5714

a) = 1.1204
b) = 0.5714

a) = 1.1204
b) = 0.5714

= 51/20

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= 3/14

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= 4/7 - 2/7 

= 2/7

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= 17/45

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= 2/3 

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= 2 x 1/4 

= 1/2

a,4/7

b,5/8

c,7/2

a)2/3*4/7+1/3*4/7=(2/3+1/3)*4/7=1*4/7=4/7

b)5/8*3/7*7/3=5/8*1=5/8

c)(4/5+2)*5/4=4/5*5/4+2=1+2=3

a, 4/7

b,5/8

c, 7/2

a) 19/23

b) -5/11

a) 8/3 x 2/5 x 3/8 x 10 x 19/92

= ( 8/3 x 3/8 ) x ( 2/5 x 10 ) x 19/92

=     1 x 4 x 19/92

=     4 x 19/92   =   76/92  =  19/23

b) N = 5/7 x 5/11 + 5/7 x 2/11 - 5/7 x 14/11

       = 5/7 x ( 5/11 + 2/11 - 14/11 )

       = 5/7 x ( -7/11 )

       =   -5/11

Ban Tran Nguyen Dam Nhien trinh bay cach giai duoc khong?