题目内容
脱式计算.
124-735÷7 | (34+22)÷8 | 45÷(15÷3) | 81×7÷9 | 576÷3÷4 |
205+7×8 | 62-(25-7) | 32×4+72 | 294+399÷7 | 672÷(2×3) |
考点:整数四则混合运算
专题:运算顺序及法则
分析:(1)先算除法,再算减法;
(2)先算加法,再算除法;
(3)先算小括号里面的除法,再算括号外面的除法;
(4)按从左向右的顺序进行计算;
(5)按从左向右的顺序进行计算;
(6)先算乘法,再算加法;
(7)先算小括号里面的减法,再算括号外面的减法;
(8)先算乘法,再算加法;
(9)先算除法,再算加法;
(10)先算乘法,再算除法.
(2)先算加法,再算除法;
(3)先算小括号里面的除法,再算括号外面的除法;
(4)按从左向右的顺序进行计算;
(5)按从左向右的顺序进行计算;
(6)先算乘法,再算加法;
(7)先算小括号里面的减法,再算括号外面的减法;
(8)先算乘法,再算加法;
(9)先算除法,再算加法;
(10)先算乘法,再算除法.
解答:
解:(1)124-735÷7
=124-105
=19;
(2)(34+22)÷8
=56÷8
=7;
(3)45÷(15÷3)
=45÷5
=9;
(4)81×7÷9
=567÷9
=63;
(5)576÷3÷4
=192÷4
=48;
(6)205+7×8
=205+56
=261;
(7)62-(25-7)
=62-18
=44;
(8)32×4+72
=128+72
=200;
(9)294+399÷7
=294+57
=351;
(10)672÷(2×3)
=672÷6
=112.
=124-105
=19;
(2)(34+22)÷8
=56÷8
=7;
(3)45÷(15÷3)
=45÷5
=9;
(4)81×7÷9
=567÷9
=63;
(5)576÷3÷4
=192÷4
=48;
(6)205+7×8
=205+56
=261;
(7)62-(25-7)
=62-18
=44;
(8)32×4+72
=128+72
=200;
(9)294+399÷7
=294+57
=351;
(10)672÷(2×3)
=672÷6
=112.
点评:考查了整数四则混合运算,注意运算顺序和运算法则,然后再进一步计算.
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