Tính:
a) \(\displaystyle{8 \over 7}:4 \) \(\displaystyle25:{5 \over {11}} \)
b) \(\displaystyle 26,64 : 37\) \(\displaystyle150,36 : 53,7\) \(\displaystyle0,486 : 0,36\)
a)
\(\displaystyle{8 \over 7}:4 ={8 \over 7} : {4 \over 1} ={8 \over 7} \times {1 \over 4} \displaystyle={8 \over 28}= {2 \over 7} \\\displaystyle25:{5 \over {11}} = 25 \times {{11} \over 5} \displaystyle =\frac{25\times 11}{5}= 55\)
b)
-- Mod Toán lớp 5