Tính (theo mẫu):
Mẫu:
a) \(\displaystyle {5 \over {11}} \times 7\) b) \(\displaystyle {{21} \over 5} \times 1\) c) \(\displaystyle {5 \over 6} \times 0\)
a) \(\displaystyle {5 \over {11}} \times 7 = {{5 \times 7} \over {11}} = {{35} \over {11}}\)
b) \(\displaystyle {{21} \over 5} \times 1 = {{21 \times 1} \over 5} = {{21} \over 5}\)
c) \(\displaystyle {5 \over 6} \times 0 = {{5 \times 0} \over 6} = 0\)
-- Mod Toán lớp 4