a/\(\frac{3}{5}.\frac{2}{3}:\frac{1}{2}=\frac{2}{5}:\frac{1}{2}=\frac{4}{5}\)
b/\(\left(\frac{5}{7}-\frac{2}{5}\right):\frac{11}{7}=\frac{25-14}{35}:\frac{11}{7}=\frac{11}{35}:\frac{11}{7}=\frac{1}{5}\)
Thấy đúng thì tk nha, thanks ^_^
\(\text{Tính giá trị biểu thức : }\)
\(a,\text{ }\frac{2}{5}\text{ x }\frac{2}{3}\text{ : }\frac{1}{2}\)
\(=\frac{4}{15}\text{ : }\frac{1}{2}\)
\(=\frac{4}{15}\text{ x }\frac{2}{1}\)
\(=\frac{8}{15}\)
\(b,\text{ }\left(\frac{5}{7}-\frac{2}{5}\right)\text{ : }\frac{11}{7}\)
\(=\left(\frac{25}{35}-\frac{14}{35}\right)\text{ : }\frac{11}{7}\)
\(=\frac{11}{35}\text{ : }\frac{11}{7}\)
\(=\frac{11}{35}\text{ x }\frac{7}{11}\)
\(=\frac{77}{385}=\frac{1}{5}\)
Bài 3 : Tính giá trị biểu thức :
a ) \(\frac{3}{5}×\frac{2}{3}:\frac{1}{2}\)
\(=\frac{2}{5}:\frac{1}{2}\)
\(=\frac{2}{5}×2\)
\(=\frac{2×2}{5}\)
\(=\frac{4}{5}\)
b) \(\left(\frac{5}{7}-\frac{2}{5}\right):\frac{11}{7}\)
\(=\left(\frac{25}{35}-\frac{14}{35}\right):\frac{11}{7}\)
\(=\frac{11}{35}:\frac{11}{7}\)
\(=\frac{11}{35}×\frac{7}{11}\)
\(=\frac{7}{35}=\frac{1}{5}\)
