1.(8/9+1又3/7+6/11)÷(3/11+5/7+4/9)
= 2×(4/9+5/7+3/11)÷(3/11+5/7+4/9)
= 2
2.(3又7/11+1又12/13)÷(1又5/11+10/13)
= (40/11+25/13)÷(16/11+10/13)
= 【5×(8/11+5/13)】÷【2×(8/11+5/13)】
= 5÷2
= 2.5
3.(96又63/73+36又24/25)÷(32又21/73+12又8/25)
= 3×(32又21/73+12又8/25)÷(32又21/73+12又8/25)
= 3