入力1
 Input A and B
 A, B = ?
10 5
 Input L and M
 L, M = ?
10 5
 A/B =   2.00000000    
 L/M =           2
入力2
 Input A and B
 A, B = ?
7 3
 Input L and M
 L, M = ?
7 3
 A/B =   2.33333325    
 L/M =           2
入力3
 Input A and B
 A, B = ?
-7 3
 Input L and M
 L, M = ?
-7 3
 A/B =  -2.33333325    
 L/M =          -2