1.Tính:
a)889972+96306 b)726,83-349,67
c)\(\frac{7}{8}+\frac{3}{4}\) d)\(2-\frac{5}{6}\)
2.Tính:
a)\(\frac{2}{5}+\frac{3}{4};\frac{7}{12}-\frac{2}{7}+\frac{1}{12};\frac{12}{17}-\frac{5}{17}-\frac{4}{17}.\)
b)\(675,39+342,14;563,87+403,13-328,35.\)
Giúp mình với !!!!!