Cách làm cho bạn:
a. Tính:
$\frac{1}{2}\times \frac{2}{3}\times \frac{3}{4}\times \frac{4}{5}=\frac{1\times \not{2}\times \not{3}\times \not{4}}{\not{2}\times \not{3}\times\not{4}\times 5}=\frac{1}{5}$
$\frac{4}{3}:\frac{5}{4}:\frac{6}{5}:\frac{7}{6}=\frac{4}{3}\times \frac{4}{5}\times \frac{5}{6}\times \frac{6}{7}=\frac{4\times 4\times \not{5}\times \not{6}}{3\times \not{5}\times \not{6}\times 7}=\frac{16}{21}$
b. Ta nối như sau:
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