Question

Tính:

\(\frac{5}{2.1}+\frac{4}{1.11}+\frac{3}{11.2}+\frac{1}{2.15}+\frac{13}{15.4}\)

Answer 1

Trả lời:

\(\frac{5}{2\cdot1}+\frac{4}{1\cdot11}+\frac{3}{11\cdot2}+\frac{1}{2\cdot15}\)\(+\frac{13}{15\cdot4}\)

\(=\frac{5}{2}+\frac{4}{11}+\frac{3}{22}+\frac{1}{30}\)\(+\frac{13}{60}\)

\(=\frac{55+8+3}{22}\)\(+\frac{2+13}{60}\)

\(=\frac{66}{22}\)\(+\frac{1}{4}\)

\(=\frac{13}{4}\)

Hc tốt #