Question

TÍNH

\(\frac{1}{2\cdot15}+\frac{3}{2\cdot11}+\frac{4}{1\cdot11}+\frac{5}{1\cdot2}\)

CÁC CAO NHÂN GIÚP EM

Answer 1

    \(\frac{1}{2.15}+\frac{3}{2.11}+\frac{4}{1.11}+\frac{5}{1.2}\)

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

\(=\frac{1}{30}+\frac{1}{2}+\frac{5}{2}\)

\(=\frac{1}{30}+3\)

\(=\frac{91}{30}\)

Answer 2

= 3 \(\frac{1}{30}\)Hoặc  =\(\frac{91}{30}\)

Answer 3

ta có 

1/15.2=1/30=11/330

3/2.11=3/22=45/330

4/1.11=4/11=120/330

5/1.2=5/2=825/330

=>11/330+45/330+120/330+825/330

=11+45+120+825/330

=1001/330=91/330