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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
\(\frac{9}{16}:\frac{27}{8}=\frac{3^2:3^3}{2^4:2^3}=\frac{\frac{1}{3}}{2}=\frac{1}{6}\)
b tương tự nha
\(\frac{9}{16}:\frac{27}{8}=\frac{9}{16}\cdot\frac{8}{21}=\frac{3\cdot3\cdot4\cdot2}{8\cdot2\cdot7\cdot3}=\frac{14}{3}\)
\(\frac{40}{7}:\frac{5}{14}=\frac{40}{7}\cdot\frac{14}{5}=\frac{4\cdot5\cdot2\cdot7\cdot2}{7\cdot5}=\frac{16}{1}=16\)
Chúc bạn học tốt
\(\frac{2}{5}\)x \(\frac{3}{7}\)x\(\frac{2}{5}\)x\(\frac{4}{7}\)
=\(\frac{2}{5}\)x ( \(\frac{3}{7}+\frac{4}{7}\))
=\(\frac{2}{5}\)x\(1\)
=\(\frac{2}{5}\)
\(3+\frac{2}{5}-\frac{3}{4}\times\frac{4}{5}\)
\(=3+\frac{2}{5}+\frac{3}{5}\)
\(=3+1\)
\(=4\)
b, \(\frac{4}{5}\text{ }\text{x}\frac{9}{7}-\frac{4}{5}\text{x}\frac{3}{14}\)
\(\frac{4}{5}\text{x}\left(\frac{9}{7}-\frac{3}{14}\right)\)
\(\frac{4}{5}\text{x}\frac{15}{14}\)
\(=\frac{6}{7}\)