11分之6*17-12*11分之6
=6/11*17-12*6/11
=6/11(17-12)
=6/11*5
=30/11
把第二道回答就采纳后2道我回了67*66分之65-66分之1=(66+1)*65/66-1/66=66*65/66+1*65/66-1/66=65+64/66=65+32/33=65又32/33