计算下面各题.350×(120-60)÷15125×25×32585-(15+20)×323×199+2372×5+72×4+7234×72+34×28203×99
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解决时间 2021-03-24 06:34
- 提问者网友:骨子里的高雅
- 2021-03-23 19:26
计算下面各题. 350×(120-60)÷15125×25×32585-(15+20)×323×199+2372×5+72×4+7234×72+34×28203×99(80+4)×25.
最佳答案
- 五星知识达人网友:风格不统一
- 2021-03-23 20:48
解:(1)350×(120-60)÷15,
=350×60÷15,
=21000÷15,
=1400;
(2)125×25×32,
=125×25×8×4,
=(125×8)×(25×4),
=1000×100,
=100000;
(3)585-(15+20)×3,
=585-35×3,
=585-105,
=480;
(4)23×199+23,
=23×(199+1),
=23×200,
=4600;
(5)72×5+72×4+72,
=72×(5+4+1),
=72×10,
=720;
(6)34×72+34×28,
=34×(72+28),
=34×100,
=3400;
(7)203×99,
=203×(100-1),
=203×100-203×1,
=20300-203,
=20097;
(8)(80+4)×25,
=80×25+4×25,
=2000+100,
=2100.解析分析:(1)先算小括号里面的减法,再算括号外的乘法,最后算括号外的除法;
(2)先把32分解成8×4,再运用乘法结合律简算;
(3)先算小括号里面的加法,再算括号外的乘法,最后算减法;
(4)(5)(6)(7)(8)运用乘法分配律简算.点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
=350×60÷15,
=21000÷15,
=1400;
(2)125×25×32,
=125×25×8×4,
=(125×8)×(25×4),
=1000×100,
=100000;
(3)585-(15+20)×3,
=585-35×3,
=585-105,
=480;
(4)23×199+23,
=23×(199+1),
=23×200,
=4600;
(5)72×5+72×4+72,
=72×(5+4+1),
=72×10,
=720;
(6)34×72+34×28,
=34×(72+28),
=34×100,
=3400;
(7)203×99,
=203×(100-1),
=203×100-203×1,
=20300-203,
=20097;
(8)(80+4)×25,
=80×25+4×25,
=2000+100,
=2100.解析分析:(1)先算小括号里面的减法,再算括号外的乘法,最后算括号外的除法;
(2)先把32分解成8×4,再运用乘法结合律简算;
(3)先算小括号里面的加法,再算括号外的乘法,最后算减法;
(4)(5)(6)(7)(8)运用乘法分配律简算.点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
全部回答
- 1楼网友:蕴藏春秋
- 2021-03-23 21:52
感谢回答,我学习了
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