86+357-14

=443-14

=429

Hok tốt

(20052005/20062006-20042004/20052005)x2005/2006

=(2005x10001/2006x10001-2004x10001/2005x10001)x2005/2006

=(2005/2006-2004/2005)x2005/2006

=((2005x2005-2004x2006)/2006x2005)x2005/2006

=((2004x2005+2005-2004x2005+2004)/2005x2006)x2005/2006

=(1/2005x2006)x2005/2006

=2005/2005x2006x2006

=1/2006x2006=1/4024036

chúc bạn học tốt nha :)

cam on lim nayeon nhe.Ban fan k-pop ak?

a: =>4y+15/16=1

=>4y=1/16

=>y=1/64

b: =>10y+1/2+1/4+...+1/1024=1

=>10y+1023/1024=1

=>10y=1/1024

=>y=1/10240

5738 - (262 -250) = 5726

\(5738-\left(250-262\right)\)

\(=5738-\left(-12\right)\)

\(=5750\)

5738 - ( 250 - 262 ) 

= 5738 - 250 - 262

= 5488 - 262

= 5226

Ủng hộ tk Đúng nhé ! ^^ 

a)(-45).312-312-54.312

=312.[(-45)-1-54]

=312.(-100)

=-31200

b)217.(-46)-217.15-217.40+27

=217.[(-46)-15-40]+27

=217.(-101)+27

=217.[(-100)+(-1)]+27

=-21700+(-217)+27

=-21700+(-190)

=-21890

-43.15+43.48-48.43+48.15

=(-43.15+48.15)-(43.48-48.43)

=5.15-0=75

đề bài kiểu đấy có thánh nhìn cx k ra

hơi dài ban a

\(=\left(\dfrac{2}{2}+\dfrac{1}{2}\right)\)x \(\left(\dfrac{3}{3}+\dfrac{1}{3}\right)\) x\(\left(\dfrac{4}{4}+\dfrac{1}{4}\right)\) x \(\left(\dfrac{5}{5}+\dfrac{1}{5}\right)\)

\(=\dfrac{3}{2}\) x \(\dfrac{4}{3}\) x \(\dfrac{5}{4}\) x \(\dfrac{6}{5}\) 

\(=3\)

= 2

3