Tính :
a) \(\displaystyle {2 \over 3} \times {5 \over 6}\) b) \(\displaystyle {3 \over 4} \times 12\)
c) \(\displaystyle {6 \over 5}:{2 \over 3}\) d) \(\displaystyle {3 \over 8}:2\)
a) \(\displaystyle {2 \over 3} \times {5 \over 6} = {{10} \over {18}} = {5 \over 9}\)
b) \(\displaystyle {3 \over 4} \times 12 = \dfrac{3 \times 12}{4}= \dfrac{36}{4}= 9\)
c) \(\displaystyle {6 \over 5}:{2 \over 3} = {6 \over 5} \times {3 \over 2} =\dfrac{18}{10}= {9 \over 5}\)
d) \(\displaystyle {3 \over 8}:2 = {3 \over {8 \times 2}} = {3 \over {16}}\)
-- Mod Toán lớp 4