= \(\frac{528}{528}\) = 1

=528/528=1 nha

HT

=>2x=2/3

hay x=1/3

\(\dfrac{9}{7}\times x+\dfrac{5}{7}\times x=\dfrac{2}{3}\)

\(\dfrac{14}{7}\times x=\dfrac{2}{3}\)

\(x=\dfrac{2}{3}:2=\dfrac{1}{3}\)

\(a,\left(\dfrac{31}{35}-\dfrac{4}{7}\right)\times\dfrac{8}{7}:2\\ =\left(\dfrac{31}{35}-\dfrac{4\times5}{35}\right)\times\dfrac{8}{7}:2\\ =\dfrac{11}{35}\times\dfrac{8}{7}:2\\ =\dfrac{88}{245}:2\\ =\dfrac{44}{245}\\ b,\left(1-\dfrac{1}{2}\right)\times\left(1-\dfrac{1}{3}\right)\times\left(1-\dfrac{1}{4}\right)\times\left(1-\dfrac{1}{5}\right)\\ =\left(\dfrac{2-1}{2}\right)\times\left(\dfrac{3-1}{3}\right)\times\left(\dfrac{4-1}{4}\right)\times\left(\dfrac{5-1}{5}\right)\\ =\dfrac{1}{2}\times\dfrac{2}{3}\times\dfrac{3}{4}\times\dfrac{4}{5}\\ =\dfrac{1}{3}\times\dfrac{3}{4}\times\dfrac{4}{5}\\ =\dfrac{1}{4}\times\dfrac{4}{5}=\dfrac{1}{5}\)

a, ( \(\dfrac{31}{35}\) - \(\dfrac{4}{7}\)) \(\times\) \(\dfrac{8}{7}\): 2

= \(\left(\dfrac{31}{35}-\dfrac{20}{35}\right)\) \(\times\) \(\dfrac{8}{7}\) : 2

= \(\dfrac{11}{35}\) \(\times\) \(\dfrac{8}{7}\) \(\times\) \(\dfrac{1}{2}\)

= \(\dfrac{44}{35}\) \(\times\) \(\dfrac{4}{7}\)

= \(\dfrac{44}{245}\)

b, ( 1 - \(\dfrac{1}{2}\)) \(\times\) ( 1 - \(\dfrac{1}{3}\)) \(\times\) ( 1 - \(\dfrac{1}{4}\)) \(\times\) ( 1 - \(\dfrac{1}{5}\))

= \(\dfrac{1}{2}\) \(\times\) \(\dfrac{2}{3}\) \(\times\) \(\dfrac{3}{4}\) \(\times\) \(\dfrac{4}{5}\)

= \(\dfrac{1}{5}\) \(\times\) \(\dfrac{2\times3\times4}{2\times3\times4}\)

= \(\dfrac{1}{5}\)

nhanh lên

mik đag vội

7/8-1/2=3/8

7/8 - 1/2

= 7/8- 4/8

= 3/8

x:8/11=11/3

x=11/3X8/11

x=8/3

b) 2/5:x=1/4

x=2/5:1/4

x=8/5

c)4/5+5/7:x=1/6=?

ai tích mình tích lại 

a) x = 88/33=8/3

b) x = 8/5

c) x = 150/133

:-=

   (11 x 9 - 100 + 1) x (1 x 2 x ... x 10)
= (99 + 1 - 100) x 1 x 2 x ... x 10
= 0 x 1 x 2 x ... x 10
= 0

(11x9-100+1) x (1x2x.....x10)

= (99-100+1) x (1x2x.....x10)

= 0 x (1x2x.....x10)

= 0 

bằng 1220 nha

=1220 nha nhớ cho milk 1 k nhé