Tính (theo mẫu):
Mẫu: \(\displaystyle 3 \times {5 \over 8} = {{3 \times 5} \over 8} = {{15} \over 8}\)
a) \(\displaystyle 4 \times {5 \over {11}}\) b) \(\displaystyle 1 \times {{51} \over 4}\) c) \(\displaystyle 0 \times {{12} \over 5}\)
a) \(\displaystyle 4 \times {5 \over {11}} = {{4 \times 5} \over {11}} = {{20} \over {11}}\)
b) \(\displaystyle 1 \times {{51} \over 4} = {{1 \times 51} \over 4} = {{51} \over 4}\)
c) \(\displaystyle 0 \times {{12} \over 5} = {{0 \times 12} \over 5} = 0\)
-- Mod Toán lớp 4