题目内容
17.脱式计算下面各题452+1358-807 | 32×59-1034 | 52×340+625 |
3815÷35-27 | 308×125÷25 | 35×(729÷27) |
2405÷(85-48) | 88×(9050-4909) | 945×(2233÷29) |
分析 (1)(5)按照从左到右的顺序计算;
(2)先算乘法,再算减法;
(3)先算乘法,再算加法;
(4)先算除法,再算减法;
(6)(9)先算除法,再算乘法;
(7)先算减法,再算除法;
(8)先算减法,再算乘法.
解答 解:(1)452+1358-807
=1810-807
=1003;
(2)32×59-1034
=1888-1034
=854;
(3)52×340+625
=17680+625
=18305;
(4)3815÷35-27
=109-27
=82;
(5)308×125÷25
=38500÷25
=1540;
(6)35×(729÷27)
=35×27
=945;
(7)2405÷(85-48)
=2405÷37
=65;
(8)88×(9050-4909)
=88×4141
=364408;
(9)945×(2233÷29)
=945×77
=72765.
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.
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