F1 英文數學題

有數條數學題，求解 ! ! !

1. Use all the number 10 , 20 , 30 , 40 and 50 with the arithmetic operations and bracket , write down an expression with a result of 0 .


2. Give three numbers A , B and C . If the HCF of A and B is 2 , B and Cis 5 amd A and C is 3 , find three number .


3. Suggest two fractions with different denominators but the same numerators such that their difference 5/12(5 over 12) .


4. Suggest three different mixed numbers such that their product is an integer .