Question

[Trần Quang Khải]

5/2*1+4/1*11+3/11*2+1/2*15+13/15*4=?

Answer 1

[Lê Hoàng Minh +™( ✎﹏TΣΔM ΔΠGΣLS ΩҒ...]

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

\(A=7\left(\frac{5}{2.7}+\frac{4}{7.11}+\frac{3}{11.14}+\frac{1}{14.15}+\frac{13}{15.28}.\right)\)

\(A=7\left(\frac{1}{2}-\frac{1}{7}+\frac{1}{7}-\frac{1}{11}+\frac{1}{11}-......+\frac{1}{15}-\frac{1}{28}\right)\)

\(A=7\left(\frac{1}{2}-\frac{1}{28}\right)\)

\(A=7.\frac{13}{4}\)

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

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