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\(\dfrac{3}{4}\cdot\dfrac{2}{5}-\dfrac{3}{4}\cdot\dfrac{2}{7}\)
= \(\dfrac{3}{4}\cdot\left(\dfrac{2}{5}-\dfrac{2}{7}\right)\)
= \(\dfrac{3}{4}\cdot\left(\dfrac{14}{35}-\dfrac{10}{35}\right)\)
= \(\dfrac{3}{4}\cdot\dfrac{4}{35}\)
= \(\dfrac{3}{35}\)
\(\frac{3}{4}+\frac{5}{9}:\frac{4}{5}=\frac{3}{4}+\frac{5}{9}\times\frac{5}{4}\)
\(=\frac{3}{4}+\frac{25}{36}=\frac{27}{36}+\frac{25}{36}=\frac{27+25}{36}=\frac{52}{36}=\frac{13}{9}\)
\(\frac{7}{19}\times\frac{4}{7}-\frac{7}{19}\times\frac{3}{7}=\frac{7}{19}\times\left(\frac{4}{7}-\frac{3}{7}\right)\)
\(=\frac{7}{19}\times\frac{1}{7}=\frac{1}{19}\)
\(\frac{1}{3}x\)\(\frac{1}{2}-\frac{1}{5}x\)\(\frac{1}{2}\)
=(\(\frac{1}{3}-\frac{1}{5}\)) x \(\frac{1}{2}\)
=\(\frac{2}{15}x\)\(\frac{1}{2}\)
=\(\frac{1}{15}\)
1/3 * 1/2 - 1/5 * 1/2
= (1/3 + 1/5) * 1/2
=8/15*1/2
=4/15
5/2 lớn hơn 3/7
4/3 lớn hơn.
3/2 lớn hơn.
3/9=1/3
9/12=3/4
8/18=1/4
60/36=10/6
17/34=1/2
17/51=1/3
35/100=7/25
25/100=1/4
8/1000=1/125
24/30=8/10
18/54=1/3
72/42=24/14=12/7
Xin lỗi vì ko giải hết cho cậu nhưng mình phải đi ngủ đây.Hôm sau minh giải mốt phần còn lại cho
\(\dfrac{3}{4}.\dfrac{2}{3}-\dfrac{1}{6}.\dfrac{3}{4}-\dfrac{3}{4}.\dfrac{1}{2}\)
= \(\dfrac{3}{4}.\left(\dfrac{2}{3}-\dfrac{1}{6}-\dfrac{1}{2}\right)\)
= \(\dfrac{3}{4}.0\)
= 0
\(\dfrac{3}{4}\cdot\dfrac{2}{3}-\dfrac{1}{6}\cdot\dfrac{3}{4}-\dfrac{3}{4}\cdot\dfrac{1}{2}\)
\(=\dfrac{3}{4}\left(\dfrac{2}{3}-\dfrac{1}{6}-\dfrac{1}{2}\right)\)
\(=\dfrac{3}{4}\cdot\left(\dfrac{4}{6}-\dfrac{1}{6}-\dfrac{3}{6}\right)\)
=0
\(x:\dfrac{3}{4}=1-\dfrac{2}{5}\\ \Rightarrow x\cdot\dfrac{4}{3}=\dfrac{3}{5}\\ \Rightarrow x=\dfrac{3}{5}:\dfrac{4}{3}=\dfrac{9}{20}\)
\(x:\dfrac{3}{4}=1-\dfrac{2}{5}\)
\(\Rightarrow x:\dfrac{3}{4}=\dfrac{3}{5}\)
\(\Rightarrow x=\dfrac{3}{5}\times\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{9}{20}\)