Toán Lớp 6: Quy đồng 2 phân số 3/20;7/40 2/15; 3/75 6/25 5và 1/3

Question

Toán Lớp 6:  Quy đồng 2 phân số 3/20;7/40 2/15; 3/75 6/25 5và 1/3

annhocbichchaubich · Answer

#andy     [ begin{array}{l} a) frac{3}{{20}}; frac{7}{{40}} left( {MC:40}  right)    =  frac{{3.2}}{{20.2}}; frac{7}{{40}}    =  frac{6}{{40}}; frac{7}{{40}}   b) frac{2}{{15}}; frac{3}{{75}}; frac{6}{{25}}    =  frac{2}{{15}}; frac{1}{{25}}; frac{6}{{25}} left( {MC:75}  right)    =  frac{{2.5}}{{15.5}}; frac{{1.3}}{{25.3}}; frac{{6.3}}{{25.3}}    =  frac{{10}}{{75}}; frac{3}{{75}}; frac{{18}}{{75}}   c)5; frac{1}{3} left( {MC:3}  right)    =  frac{5}{1}; frac{1}{3}    =  frac{{5.3}}{{1.3}}; frac{1}{3}    =  frac{{15}}{3}; frac{1}{3}     end{array} ]

behocgioitoan · Answer

+) Ta c&oacute;: 3/20=(3xx2)/(20xx2)=6/40                   7/40=7/40  +) Ta c&oacute;: 2/15=(2xx5)/(15xx5)=10/75                  3/75=3/75                  6/25=(6xx3)/(25xx3)=18/75  +)Ta c&oacute;: 5=5/1=(5xx3)/(1xx3)=15/3                  1/3=1/3