(2012•儋州模拟)计算下列各题,怎样简便就怎样算.

1个回答

  • 解题思路:(1)依据四则运算计算方法解答,

    (2)(3)(4)运用乘法分配律解答.

    (1)35÷[7/5]+[5/7],

    =25+[5/7],

    =25[5/7];

    (2)(40+4+0.4)×2.5,

    =40×2.5+4×2.5+0.4×2.5,

    =100+10+1,

    =111;

    (3)[5/9]×[7/13]+[6/13]×[5/9],

    =([7/13+

    6

    13])×[5/9],

    =1×[5/9],

    =[5/9];

    (4)([2/27]+[2/23])×27×23,

    =[2/27]×27×23+[2/23]×27×23,

    =46+54,

    =100.

    点评:

    本题考点: 运算定律与简便运算.

    考点点评: 解答此类题型的重点是:依据题干中各数的特点,正确选择并运用简便算法解答.