题目内容
脱式计算
235÷5×28 | 480÷(242-238) | 729÷9÷3 | (400+202)÷7. |
分析:(1)(3)按照从左到右的顺序计算;
(2)先算小括号里面的减法,再算括号外的除法;
(4)先算小括号里面的加法,再算括号外的除法.
(2)先算小括号里面的减法,再算括号外的除法;
(4)先算小括号里面的加法,再算括号外的除法.
解答:解:(1)235÷5×28,
=47×28,
=1316;
(2)480÷(242-238),
=480÷4,
=120;
(3)729÷9÷3,
=81÷3,
=27;
(4)(400+202)÷7,
=602÷7,
=86.
=47×28,
=1316;
(2)480÷(242-238),
=480÷4,
=120;
(3)729÷9÷3,
=81÷3,
=27;
(4)(400+202)÷7,
=602÷7,
=86.
点评:本题关键是理清楚运算顺序,找出先算什么,再算什么,根据运算顺序逐步计算即可.
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