Question

B=\(\frac{5}{9}x\frac{7}{13}+\frac{5}{9}x\frac{9}{13}-\frac{5}{9}x\frac{3}{13}\)

Answer 1

B=\(\frac{5}{9}\)x{\(\frac{7}{13}\)+\(\frac{9}{13}\)-\(\frac{3}{13}\)}

B=\(\frac{5}{9}\)x 1

B=\(\frac{5}{9}\)

Vậy B=\(\frac{5}{9}\)

Chúc bạn hok tốt

Answer 2

bằng 5/9 , chúc bạn học tốt !

Answer 3

B = \(\frac{5}{9}.\frac{7}{13}+\frac{5}{9}.\frac{9}{13}-\frac{5}{9}.\frac{3}{13}\)

Ta thấy có phân số \(\frac{5}{9}\) là thừa số chung

\(\Leftrightarrow\frac{5}{9}\left(\frac{7}{13}+\frac{9}{13}-\frac{3}{13}\right)=\frac{5}{9}\left(\frac{7+9+3}{13}\right)\)

\(=\frac{5}{9}.\frac{19}{13}\left(\frac{5.19}{9.13}\right)\)

\(=\frac{95}{117}\)

Answer 4

Làm lại

\(B=\frac{5}{9}.\frac{7}{13}+\frac{5}{9}.\frac{9}{13}-\frac{5}{9}.\frac{3}{13}\)

Ta thấy phân số \(\frac{5}{9}\) là thừa số chung . Ta có :

\(\Leftrightarrow\frac{5}{9}\left(\frac{7}{13}+\frac{9}{13}-\frac{3}{13}\right)\)

\(=\frac{5}{9}.\frac{13}{13}=\frac{5}{9}.1\)

\(=\frac{5}{9}\)

Answer 5

\(=\frac{5}{9}x\cdot\left(\frac{7}{13}+\frac{9}{13}-\frac{3}{13}\right)=\frac{5}{9}x\cdot\left(\frac{16}{13}-\frac{3}{13}\right)=\frac{5}{9}x\cdot\frac{13}{13}=\frac{5}{9}x\cdot1=\frac{5}{9}x\)