=382.459149

=382.459149

Đặt A = 34/7x13 + 51/13x22 + 85/22x37 + ... + 68/37x49

\(\frac{3}{17}.A=\frac{6}{7x13}+\frac{9}{13x22}+\frac{15}{22x37}+\frac{12}{37x49}\)

\(\frac{3}{17}.A=\frac{1}{7}-\frac{1}{13}+\frac{1}{13}-\frac{1}{22}+\frac{1}{22}-\frac{1}{37}+\frac{1}{37}-\frac{1}{49}\)

\(\frac{3}{17}.A=\frac{1}{7}-\frac{1}{49}\)

\(\frac{3}{17}.A=\frac{6}{49}\)
\(A=\frac{6}{49}:\frac{3}{17}\)

\(A=\frac{6}{49}x\frac{17}{3}=\frac{34}{49}\)

Đặt A = 34/7x13 + 51/13x22 + 85/22x37 + 68/37x49

\(A=17x\left(\frac{2}{7x13}+\frac{3}{13x22}+\frac{5}{22x37}+\frac{4}{37x49}\right)\)

\(\frac{3}{17}xA=\frac{6}{7x13}+\frac{9}{13x22}+\frac{15}{22x37}+\frac{12}{37x49}\)

\(\frac{3}{17}xA=\frac{1}{7}-\frac{1}{13}+\frac{1}{13}-\frac{1}{22}+\frac{1}{22}-\frac{1}{37}+\frac{1}{37}-\frac{1}{49}\)

\(\frac{3}{17}xA=\frac{1}{7}-\frac{1}{49}\)

\(\frac{3}{17}xA=\frac{6}{49}\)

\(A=\frac{6}{49}:\frac{3}{17}\)

\(A=\frac{6}{49}x\frac{17}{3}=\frac{34}{49}\)

khó thế bạn =))) kết bạn vs mk nha

bn phải viết đề bài rõ hơn thì mới giúp dc ..đề bài này rối lắm

tick mình nah mọi ngừoi

Chọn A

A

A 

a) 57 + 28 = 85

24 + 67 = 91

46 + 39 = 85

b) 83 - 19 = 64

42 - 38 = 4

90 - 76 = 14

\(\begin{array}{*{20}{c}}{a)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{57}\\{28}\end{array}}\\\hline{\,\,\,\,85}\end{array}\)                            \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{24}\\{67}\end{array}}\\\hline{\,\,\,\,91}\end{array}\)                            \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{46}\\{39}\end{array}}\\\hline{\,\,\,\,85}\end{array}\)

\(\begin{array}{*{20}{c}}{b)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{83}\\{19}\end{array}}\\\hline{\,\,\,\,64}\end{array}\)                           \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{42}\\{38}\end{array}}\\\hline{\,\,\,\,04}\end{array}\)                            \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{90}\\{76}\end{array}}\\\hline{\,\,\,\,14}\end{array}\)