Tính: (1 điểm)
a)\(\frac{3}{7}\) + \(\frac{4}{9}\) – \(\frac{1}{4}\)
= ………………………………………………………………………………………
= ………………………………………………………………………………………
b)\(\frac{1}{6}\) × \(\frac{6}{9}\) – \(\frac{1}{{10}}\)
= ………………………………………………………………………………………
= ………………………………………………………………………………………
