\(\frac{2}{3}\times\frac{4}{5}-\frac{1}{3}\times\frac{4}{5}\)

\(=\frac{8}{15}-\frac{4}{15}\)

\(=\frac{4}{15}\)

k mk nha mấy bạn

= 4/5 x (2/3 - 1/3 )

= 4/5 x 1/3

= 4/15

ủa có mẫu r thì bn dựa vào mẫu mà lm

đợi mik lm cho

Bằng một số

 1+2-3x4:5

=3-2,4

=0,6

a, = 8/15 x 5/6 = 40/90 = 4/9

b, = 5/6 x 1/5 = 5/30 = 1/6

a, \(= 8/15 x 5/6 = 40/90 = 4/9\)

b, \(= 5/6 x 1/5 = 5/30 = 1/6\)

= 107/45 nha bạn 

nhớ mình đúng nha

hok tốt ^o^

\(\frac{1}{9}+\frac{2}{3}\times4-\frac{3}{5}\div\frac{3}{2}\)

\(=\frac{1}{9}+\frac{8}{3}-\frac{3}{5}\times\frac{2}{3}\)

\(=\frac{1}{9}+\frac{24}{9}-\frac{6}{15}\)

\(=\frac{25}{9}-\frac{6}{15}\)

\(=\frac{125}{45}-\frac{18}{45}\)

\(=\frac{107}{45}\)

\(\frac{2}{3}\times\frac{4}{5}+\frac{1}{3}\times\frac{4}{5}\)

\(=\left(\frac{2}{3}+\frac{1}{3}\right)\times\frac{4}{5}\)

\(=1\times\frac{4}{5}\)

\(=\frac{4}{5}\)

2/3 x 4/5 + 1/3 x 4/5

= 4/5 x (2/3 + 1/3 )

= 4/5 x 1

= 4/5 

mong các bạn nha

TA có: \(\left(\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+\cdots+\frac{1}{8\cdot9}\right)\cdot100-\left\lbrack\frac52-\left(x+\frac{206}{100}\right)\right\rbrack:\frac12=\frac89\)

=>\(\left(1-\frac12+\frac12-\frac13+\cdots+\frac18-\frac19\right)\cdot100-\left\lbrack\frac52-\left(x+\frac{13}{50}\right)\right\rbrack\cdot2=\frac89\)

=>\(\frac89\cdot100-\left\lbrack\frac52-\left(x+\frac{13}{50}\right)\right\rbrack\cdot2=\frac89\)

=>\(2\cdot\left\lbrack\frac52-\left(x+\frac{13}{50}\right)\right\rbrack=\frac89\cdot99=88\)

=>\(\frac52-\left(x+\frac{13}{50}\right)=44\)

=>\(x+\frac{13}{50}=\frac52-44=2,5-44=-41,5\)

=>x+0,26=-41,5

=>x=-41,5-0,26

=>x=-41,76