解题思路:(1)先算括号里的加法,再算外边的减法;
(2)按从左到右的运算顺序计算;
(3)根据减法的性质计算;
(4)根据减法的性质计算.
(1)[9/11]-([9/2]+[3/1])
=[9/11]-[15/2]
=-[147/22]
(2)[6/5]+[8/5]+[6/1]+[8/3]
=[6/5]+[8/5]+[6/1]+[8/3]
=[14/5]+6+2[2/3]
=8[4/5]+2[2/3]
=11[7/15]
(3)8-[16/5]-[16/11]
=8-([16/5]+[16/11])
=8-4[36/55]
=3[19/55]
(4)[10/9]-([6/5]-[5/3])
=[10/9]+[5/3]-[6/5]
=[25/9]-[6/5]
=[71/45]
点评:
本题考点: 分数的加法和减法;运算定律与简便运算.
考点点评: 计算四则混合运算时,要按照运算顺序,先算乘除,后算加减,有括号的先算括号里面的,再算括号外面的.能简算的要简算.