Quy đồng mẫu số các phân số sau: a) -2/21; 5/-24 b) -7/12; 11/-18
Giải thích
a)
−221;5−24MC=168−221=−2.8.21.8=−161685−24=−524=−5.724.7=−35168
b)
−712;11−18MC=36−712=−7.312.3=−213611−18=−1118=−11.218.2=−2236
a)
−221;5−24MC=168−221=−2.8.21.8=−161685−24=−524=−5.724.7=−35168
b)
−712;11−18MC=36−712=−7.312.3=−213611−18=−1118=−11.218.2=−2236