X=6/5x7/6x8/7x...x2015/2014

X=6x7x8x...x2015/5x6x7x...x2014

X=2015/5=403

K nhé các bạn ơi.

403 nhe cac ban

\(x-\frac{5}{6}:1\frac{1}{6}=0,125\)

\(x-\frac{5}{6}:\frac{7}{6}=0,125\)

      \(x-\frac{5}{7}=0,125\)

                 \(x=0,125+\frac{5}{7}\)

                 \(x=\frac{47}{56}\)

x = \(\frac{47}{48}\)

13244

13244 sai roi do

sai roi 13244 sai roi

= \(\frac{4}{3}\)+ \(\frac{6}{5}\)x y - \(\frac{4}{5}\)= \(\frac{14}{5}\)

= \(\frac{8}{15}\)+ \(\frac{6}{5}\)x y = \(\frac{14}{5}\)

\(\frac{6}{5}\)x y = \(\frac{14}{5}\)- \(\frac{8}{15}\)= \(\frac{6}{15}\)

y = \(\frac{6}{15}\): \(\frac{6}{5}\)

y = \(\frac{1}{3}\)

đề gi rõ ra mới tính được

\(\frac{2}{3}\cdot x:\frac{1}{5}=1\frac{1}{3}:\frac{1}{4}\)

\(\Leftrightarrow\frac{2}{3}\cdot x:\frac{1}{5}=\frac{16}{3}\)

\(\Rightarrow\frac{2}{3}\cdot x=\frac{16}{3}\cdot\frac{1}{5}\)

\(\Rightarrow x=\frac{16}{15}:\frac{2}{3}\)

\(\Rightarrow x=\frac{8}{5}\)

Ta có :

\(\frac{2}{3}x:\frac{1}{5}=1\frac{1}{3}:\frac{1}{4}\)

\(\frac{2}{3}x:\frac{1}{5}=\frac{1}{3}:\frac{1}{4}\)

\(2x:\frac{1}{5}=\frac{4}{3}\)

\(2x=\frac{4}{3}.\frac{1}{5}\)

\(2x=\frac{4}{15}\)

\(x=\frac{4}{15}:2\)

\(\Rightarrow x=\frac{2}{15}\)

\(\frac{3}{4}\)x 8,4 + 2,8 x \(1\frac{1}{2}\)

= 0,75 x 8,4 + 2,8 x \(\frac{3}{2}\)

= 0,75 x 8,4 + 2,8 x 1,5

= 6,3 + 4,2

= 10,5

\(\frac{3}{4}\times8,4+2,8\times1\frac{1}{2}\)

\(=6,3+4,2\)

\(=10,5\)

Kết bạn với mình nha!

cam on cac cau nha 

thanks you very much