Bài 3: Tính : a) \(\frac{3}{7}\) x \(\frac{7}{3}\) ; b) \(\frac{3}{7}\) : \(\frac{3}{7}\) ; c) \(\fr
Bài 3: Tính:
a) \(\frac{3}{7}\) x \(\frac{7}{3}\) ;
b) \(\frac{3}{7}\) : \(\frac{3}{7}\) ;
c) \(\frac{2}{3}\) x \(\frac{1}{6}\) x \(\frac{9}{11}\) ;
d) \(\frac{2× 3× 4}{2 × 3 × 4 × 5}\)
Lời Giải:
Bài 3:
a) \(\frac{3}{7}\) x \(\frac{7}{3}\) = 1
b) \(\frac{3}{7}\) : \(\frac{3}{7}\) = 1
c) \(\frac{2}{3}\) x \(\frac{1}{6}\) x \(\frac{9}{11}\) = \(\frac{2 × 1 × 9}{3 × 6 × 11}\) = \(\frac{1}{ 11}\)
d) \(\frac{2 × 3 × 4}{2 × 3 × 4 × 5}\) = \(\frac{1}{5}\)