怎样简便怎样计算①[6/13]÷[5/11]×[5/6] ②[7/15]-[2/15

1个回答

  • 解题思路:(1)(2)(5)依据四则运算顺序计算方法解答,(3)(4)(6)依据乘法分配律解答.

    解;(1)[6/13÷

    5

    11×

    5

    6],

    =[66/65]×[5/6],

    =[11/13];

    (2)[7/15]-[2/15]÷0.3,

    =[7/15]-[4/9],

    =[1/45];

    (3)﹙[11/15]-[4/5]﹢[7/20]﹚÷[1/60],

    =[11/15×60−

    4

    5]×60+

    7

    20×60,

    =44-48+21,

    =65-48,

    =17;

    (4)37×[35/36],

    =(36+1)×[35/36],

    =36×[35/36]+1×[35/36],

    =35+[35/36],

    =35[35/36];

    (5)﹙4-[5/12]÷[1/6]﹚÷0.1,

    =(4-2.5)÷0.1,

    =1.5÷0.1,

    =15;

    (6)0.75×46+[3/4]×55-3÷4,

    =[3/4]×(46+55-1),

    =[3/4]×100,

    =75.

    点评:

    本题考点: 分数的四则混合运算;分数的简便计算.

    考点点评: 本题主要考查学生对于分数四则运算计算方法,以及乘法分配律知识的掌握,还要注意在计算中能约分的要约分.