脱式计算. 201+234-365 81×7÷9 399÷7+294 672÷(2×3) 455-255÷5 (369+

1个回答

  • 解题思路:(1)(2)按照从左到右的顺序计算;

    (3)先算除法,再算加法;

    (4)先算小括号里面的乘法,再算括号外的除法;

    (5)先算除法,再算减法;

    (6)先算小括号里面的加法,再算括号外的除法.

    (1)201+234-365,

    =434-365,

    =70;

    (2)81×7÷9,

    =567÷9,

    =63;

    (3)399÷7+294,

    =57+294,

    =351;

    (4)672÷(2×3),

    =672÷6,

    =112;

    (5)455-255÷5,

    =455-51,

    =404;

    (6)(369+258)÷3,

    =627÷3,

    =209.

    点评:

    本题考点: 整数四则混合运算.

    考点点评: 本题考查了简单的四则混合运算,计算时先理清楚运算顺序,根据运算顺序逐步求解即可.