(987+4097×986)÷(987×4097-3110)
=(987+4097×986)÷[(986+1)×4097-3110]
=(987+4097×986)÷[986×4097+1×4097-3110]
=(987+4097×986)÷[976×4097+987]
=1
(987+4097×986)÷(987×4097-3110)
=(987+4097×986)÷[(986+1)×4097-3110]
=(987+4097×986)÷[986×4097+1×4097-3110]
=(987+4097×986)÷[976×4097+987]
=1