题目内容
脱式计算:
195-(45+45÷9) | 43×(324-298) | (79+21)×(96÷12) |
78×(360÷60)÷3 | (183-94)×(123÷3) | (72÷3+40)×60. |
考点:整数四则混合运算
专题:运算顺序及法则
分析:(1)按照先算括号里面的除法,再算括号里面的加法,最后算括号外面的减法顺序计算解答,
(2)(5)按照先算括号里面的,再算括号外面的顺序计算解答,
(3)按照先同时计算括号里面的,再算括号外面的顺序计算解答,
(4)按照先算括号里面的,再从左到右顺序计算解答,
(6)按照先算括号里面的除法,再算括号里面的加法,最后算括号外面的乘法顺序计算解答.
(2)(5)按照先算括号里面的,再算括号外面的顺序计算解答,
(3)按照先同时计算括号里面的,再算括号外面的顺序计算解答,
(4)按照先算括号里面的,再从左到右顺序计算解答,
(6)按照先算括号里面的除法,再算括号里面的加法,最后算括号外面的乘法顺序计算解答.
解答:
解:(1)195-(45+45÷9)
=195-(45+5)
=195-50
=145;
(2)43×(324-298)
=43×26
=1118;
(3)(79+21)×(96÷12)
=100×8
=800;
(4)78×(360÷60)÷3
=78×6÷3
=468÷3
=156;
(5)(183-94)×(123÷3)
=79×41
=3239;
(6)(72÷3+40)×60
=(24+40)×60
=64×60
=3840.
=195-(45+5)
=195-50
=145;
(2)43×(324-298)
=43×26
=1118;
(3)(79+21)×(96÷12)
=100×8
=800;
(4)78×(360÷60)÷3
=78×6÷3
=468÷3
=156;
(5)(183-94)×(123÷3)
=79×41
=3239;
(6)(72÷3+40)×60
=(24+40)×60
=64×60
=3840.
点评:本题主要考查学生依据四则运算计算方法正确进行计算的能力,关键是计算结果要准确.
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