怎样算简便就怎样算.267-67×3 87×99+87 1.27+3.9+0.73+16.1 15.17-6.8-3.2

1个回答

  • 解题思路:(1)先算乘法,再算减法;

    (2)运用乘法分配律简算;

    (3)(6)运用加法结合律简算;

    (4)(5)根据减法的性质简算.

    (1)267-67×3,

    =267-201,

    =66;

    (2)87×99+87,

    =87×(99+1),

    =87×100,

    =8700;

    (3)1.27+3.9+0.73+16.1,

    =(1.27+0.73)+(3.9+16.1),

    =2+20,

    =22;

    (4)15.17-6.8-3.2,

    =15.17-(6.8+3.2),

    =15.17-10,

    =5.17;

    (5)12.75-(6.8+2.75),

    =12.75-6.8-2.75,

    =12.75-2.75-6.8,

    =10-6.8,

    =3.2;

    (6)3.25+1.83-0.25+4.17,

    =(3.25-0.25)+(1.83+4.17),

    =3+6,

    =9.

    点评:

    本题考点: 整数四则混合运算;运算定律与简便运算.

    考点点评: 此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.