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a, 6/9+5/7+1/3=2/3+5/7+1/3=5/7+1=12/7
b, 17/7+6/5-20/14=17/7+6/5-10/7=6/5+1=11/5
c,2/5x1/4+3/4x2/5=2/5x(1/4+3/4)=2/5x1=2/5
d, 6/11:4/6+5/11:2/3=6/11:2/3+5/11:2/3=(6/11+5/11):2/3=3/2
nha
Câu 1\(\frac{9}{8}.\frac{9}{3}=\frac{81}{24}\)
Câu 2 \(\frac{19}{5}+\frac{9}{5}=\frac{28}{5}\)
Câu 3 \(\frac{31}{7}:\frac{22}{5}=\frac{31.5}{7.22}=\frac{155}{154}\)
Câu 4 \(\frac{12}{1}-\frac{31}{5}=\frac{60}{5}-\frac{31}{5}=\frac{29}{5}\)
\(\frac{9}{5}\): \(\frac{7}{6}\)+ \(\frac{3}{2}\): \(\frac{7}{6}\)- \(\frac{8}{5}\)x \(\frac{6}{7}\)
\(\frac{9}{5}\div\frac{7}{6}+\frac{3}{2}\div\frac{7}{6}-\frac{8}{5}\times\frac{6}{7}\)
\(=\frac{9}{5}\times\frac{6}{7}+\frac{3}{2}\times\frac{6}{7}-\frac{8}{5}\times\frac{6}{7}\)
\(=\frac{6}{7}\times\left(\frac{9}{5}+\frac{3}{2}-\frac{8}{5}\right)\)
\(=\frac{6}{7}\times\frac{17}{10}\)
\(=\frac{102}{70}\)
\(=\frac{51}{35}\)
\(\frac{9}{5}:\frac{7}{6}+\frac{3}{2}:\frac{7}{6}-\frac{8}{5}x\frac{6}{7}\)
\(=\frac{9}{5}x\frac{6}{7}+\frac{3}{2}x\frac{6}{7}-\frac{8}{5}x\frac{6}{7}\)
\(=\frac{7}{6}x\left(\frac{9}{5}+\frac{3}{2}-\frac{8}{5}\right)\)
\(=\frac{7}{6}x\frac{17}{10}\)
\(=\frac{119}{60}\)
\(x\)là dấu nhân
\(\frac{5}{7}\times x=\frac{20}{35\times31}+\frac{30}{35\times41}+\frac{45}{50\times41}+\frac{35}{50\times57}\)
\(\frac{5}{7}\times x=5\times\left(\frac{4}{35\times31}+\frac{6}{35\times41}+\frac{9}{50\times41}+\frac{7}{50\times57}\right)\)
\(\frac{5}{7}\times x=5\times\left(\frac{1}{31}-\frac{1}{35}+\frac{1}{35}-\frac{1}{41}+\frac{1}{41}-\frac{1}{50}+\frac{1}{50}-\frac{1}{57}\right)\)
\(\frac{5}{7}\times x=5\times\left(\frac{1}{31}-\frac{1}{57}\right)\)
\(x=5\times\frac{26}{1767}:\frac{5}{7}\)
\(x=7\times\frac{26}{1767}\)
\(x=\frac{182}{1767}\)
Vậy \(x=\frac{182}{1767}\)
Nếu thấy đúng thì cho mình vài cái h đúng nha!!!