Rút gọn phân số  \(\dfrac{{1978.1979 + 1980.21 + 1958}}{{1980.1979 - 1978.1979}}\) ta được kết quả là

\(2,5\)

\(5,2\)

\(0,4\)

\(0,04\)

\(1,2\)

\(1,4\)

\(1,5\)

\(1,8\)

\(\dfrac{{3015}}{{10}}\) 

\(\dfrac{{3015}}{{100}}\)

\(\dfrac{{3015}}{{1000}}\) 

\(\dfrac{{3015}}{{10000}}\)

$35$

$36$

$37$

$34$

\(\dfrac{4}{5}\) 

\(\dfrac{4}{{ - 5}}\)

\(\dfrac{5}{4}\) 

\(\dfrac{{ - 5}}{4}\)

\(\dfrac{1}{2};\dfrac{3}{8};\dfrac{1}{3};\dfrac{6}{7}\) 

\(\dfrac{6}{7};\dfrac{1}{2};\dfrac{3}{8};\dfrac{1}{3}\)   

\(\dfrac{1}{2};\dfrac{1}{3};\dfrac{3}{8};\dfrac{6}{7}\)

$\dfrac{6}{7};\dfrac{3}{8};\dfrac{1}{3};\dfrac{1}{2}$

\(\dfrac{8}{{35}}\)

\(\dfrac{{ - 8}}{{35}}\)

\(\dfrac{{ - 12}}{{35}}\) 

\(\dfrac{{12}}{{35}}\)