Tính (rút gọn kết quả nếu có thể)
a) \(\frac{-5}{14}+\frac{-2}{14}\)
b) \(\frac{-4}{9}+\frac{5}{-8}\)
c) \(\frac{7}{21}+\frac{9}{-45}\)
d) \(\frac{-5}{2}+\frac{-2}{3}+\frac{15}{4}\)
A.a) \(\frac{{ - 1}}{2}\)
b) \(\frac{{ - 77}}{{72}}\)
c) \(\frac{2}{{15}}\)
d) \(\frac{7}{{12}}\)
B.a) \(\frac{{ - 1}}{3}\)
b) \(\frac{{ - 77}}{{62}}\)
c) \(\frac{2}{{15}}\)
d) \(\frac{7}{{12}}\)
C.a) \(\frac{{ - 1}}{2}\)
b) \(\frac{{ - 77}}{{72}}\)
c) \(\frac{2}{{15}}\)
d) \(\frac{7}{{15}}\)
D.a) \(\frac{{ - 1}}{2}\)
b) \(\frac{{ - 57}}{{72}}\)
c) \(\frac{2}{{15}}\)
d) \(\frac{7}{{12}}\)
Loga
Hóa Học lớp 12
