画出下面各题的运算顺序.185+315÷5190-12×5+564×(56-8)72-12×2(34+16)×(18-5

1个回答

  • 解题思路:(1)先算除法,再算加法;

    (2)先算乘法,再从左向右进行计算;

    (3)先算小括号里的减法,再算括号外的乘法;

    (4)先算乘法,再算减法;

    (5)先算小括号里的运算,再算括号外的乘法;

    (6)先算除法,再算乘法,最后算加法.

    (1)185+315÷5

    =185+103

    =288;

    (2)190-12×5+56

    =190-60+56

    =130+56

    =186;

    (3)4×(56-8)

    =4×48

    =192;

    (4)72-12×2

    =72-24

    =48;

    (5)(34+16)×(18-5)

    =50×13

    =650;

    (6)70+30÷6×5

    =70+5×5

    =70+25

    =95.

    点评:

    本题考点: 整数四则混合运算.

    考点点评: 整数混合运算的关键是抓住运算顺序,正确按运算顺序计算即可.