\(\left(\frac{4}{27}+\frac{4}{165}+\frac{4}{285}\right):\left(\frac{5}{84}+\frac{3}{180}+\frac{4}{285}\right)=\frac{4}{27}+\frac{4}{165}+\frac{4}{285}:\frac{5}{84}+\frac{3}{180}+\frac{4}{285}=\frac{1052}{5643}:\frac{12}{133}=\frac{1841}{891}\)

\(x-0,27=\frac{\frac{73}{77}+\frac{73}{165}+\frac{73}{285}}{25.\left(\frac{5}{84}+\frac{3}{180}+\frac{4}{285}\right)}\)

\(x-\frac{27}{100}=\frac{73.\left(\frac{1}{77}+\frac{1}{165}+\frac{1}{285}\right)}{25.4.\left(\frac{5}{4.84}+\frac{3}{4.180}+\frac{4}{4.285}\right)}\)

\(x-\frac{27}{100}=\frac{73.\left(\frac{2}{105}+\frac{1}{285}\right)}{100.\left(\frac{5}{336}+\frac{1}{240}+\frac{1}{285}\right)}\)

\(x-\frac{27}{100}=\frac{73.\left(\frac{2}{105}+\frac{1}{285}\right)}{100.\left(\frac{2}{105}+\frac{1}{285}\right)}\)

\(x-\frac{27}{100}=\frac{73}{100}\)

\(x=\frac{73}{100}+\frac{27}{100}\)

\(x=1\)

Vậy x=1

\(x=1\)nha bạn

x-0,27=(73/77+73/165+73/185):[25.12/133)

x-0,27=(73/77+73/165+73/185):[25/1.12/133)

x-0,27=(73/77+73/165+73/185):300/133

x-0,27=1387/777:300/133

x-0,27=0,791381381

x=0,791381381-0,27

x=0,521381381

                                                                                Bài làm 

x-0.27=\(\frac{73}{100}\)

x= \(\frac{73}{100}\)+\(\frac{27}{100}\)

x=\(\frac{100}{100}\)=1

      Vậy x = 1 

Tìm x :

x - 0,27 = \(\frac{73}{100}\)

x           = \(\frac{73}{100}+0,27\)

x           = 1

Cậu P khó quá mik chưa nghĩ ra cách tính nhanh nhất !

Cậu tự giải nhé !

Hok tốt

\(x-0,27=\frac{\frac{73}{77}+\frac{73}{165}+\frac{73}{285}}{25\times\left(\frac{5}{84}+\frac{3}{180}+\frac{4}{285}\right)}.\)

\(x-0,27=\frac{\frac{146}{105}+\frac{73}{285}}{25\times\left(\frac{8}{105}+\frac{4}{285}\right)}\)

\(x-0,27=\frac{\frac{219}{133}}{25\times\frac{12}{133}}\)

\(x-0,27=\frac{\frac{219}{133}}{\frac{300}{133}}\)

\(x-0,27=0,73\)

\(x=0,73+0,27\)

\(x=1\)

a, \(\frac{\left(2^3.5.7\right)\left(5^2.7^3\right)}{\left(2.5.7^2\right)^2}\)\(=\frac{2^3.5.7.5^2.7^3}{2^2.5^2.7^4}=\frac{2^3.5^3.7^4}{2^2.5^2.7^4}=10\)

b, \(\frac{4}{77}+\frac{4}{165}+\frac{4}{285}\)

\(=\frac{4}{7.11}+\frac{4}{11.15}+\frac{4}{15.19}\)

\(=\frac{1}{7}-\frac{1}{11}+\frac{1}{11}-\frac{1}{15}+\frac{1}{15}-\frac{1}{19}\)

\(=\frac{1}{7}-\frac{1}{19}\)

\(=\frac{19}{133}-\frac{7}{133}=\frac{12}{133}\)

Bài 2:

\(a,\left(x+\frac{2}{3}\right).\frac{-3}{5}+\frac{4}{7}=1\frac{4}{7}.x\)

\(\Rightarrow\frac{-3}{5}x+\frac{-2}{5}+\frac{4}{7}=\frac{11}{7}.y\)

\(\Rightarrow\frac{-3}{5}x+\frac{6}{35}=\frac{11}{7}.y\)

Từ đây làm nốt

b, \(\left|5x-2\right|\le0\)

\(\Rightarrow\left|5x\right|\le2\)( x \(\ge0\))

Mà không có số x nào nhân với 5 bé hơn hoặc bằng 2

\(\Rightarrow\)x không có giá trị thỏa mãn

c đề bài sai, chỉ tìm x chứ làm gì có y

d, \(\left(x-3\right).\left(2y+1\right)=7\)

TH1:

x - 3 = 1

x = 1 + 3

x = 4

2y + 1 = 7

2y = 7 - 1 = 6

y = 6 : 2 = 3

TH2:

x - 3 = 7

x = 7 + 3 = 10

2y + 1 = 1

2y = 1 - 1 = 0

y = 0 : 2 = 0

TH3:

x - 3 = -1

x = -1 + 3

x = 2

2y+ 1 = -7

2y = -7 - 1 = -8

y = (-8) : 2 = -4

TH4:

x - 3 = -7

x = -7 + 3

x = -4

2y + 1 = -1

2y = (-1) - 1

2y = -2

y = (-2) : 2 = -1

Vậy ......

thì ra mày đi làm những bài này ? gg , theo t , t dạy m cách giải pt bậc 2 3 4  " siêu tốc " :)

\(x-0,27=\frac{\frac{73}{77}+\frac{73}{165}+\frac{73}{285}}{28.\left(\frac{5}{84}+\frac{3}{285}+\frac{4}{285}\right)}\)

\(x-\frac{27}{100}=\frac{73.\left(\frac{1}{77}+\frac{1}{165}+\frac{1}{285}\right)}{25.4.\left(\frac{5}{4.84}+\frac{3}{4.180}+\frac{4}{4.285}\right)}\)

\(x-\frac{27}{100}=\frac{73,\left(\frac{2}{105}+\frac{1}{285}\right)}{100.\left(\frac{5}{366}+\frac{3}{240}+\frac{4}{285}\right)}\)

\(x-\frac{27}{100}=\frac{73.\left(\frac{2}{105}+\frac{1}{285}\right)}{100.\left(\frac{2}{105}+\frac{1}{285}\right)}\)

\(x-\frac{27}{100}=\frac{73}{100}\)

\(x=\frac{27}{100}+\frac{73}{100}\)

\(\Rightarrow x=1\)

bạn nguyen thi thuy linh ơi bạn làm sai đề của mk rồi

mik ko hieu lam