(1)99×6.25+6.25
(2)(5.6×0.3-0.68)÷0.25×4
(3)6.9-(0.6+4.5)÷1.7
(4)7.2÷1.25÷0.8
(5)(25.5+17.25)÷0.25+0.75
(6)2.63×2.3+2.3+6.37×2.3.
(1)99×6.25+6.25(2)(5.6×0.3-0.68)÷0.25×4(3)6.9-(0.6+4.5)÷1.7(4)7.2÷1.25÷0.8(5)(25.5+
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解决时间 2021-01-03 00:54
- 提问者网友:回忆在搜索
- 2021-01-02 21:08
最佳答案
- 五星知识达人网友:不想翻身的咸鱼
- 2021-01-02 22:28
解:(1)99×6.25+6.25,
=(99+1)×6.25,
=100×6.25,
=625;
(2)(5.6×0.3-0.68)÷0.25×4,
=(1.68-0.68)÷0.25×4,
=1÷0.25×4,
=4×4,
=16;
(3)6.9-(0.6+4.5)÷1.7,
=6.9-5.1÷1.7,
=6.9-3,
=3.9;
(4)7.2÷1.25÷0.8,
=7.2÷(1.25×0.8),
=7.2÷1,
=7.2;
(5)(25.5+17.25)÷0.25+0.75,
=42.75÷0.25+0.75,
=171+0.75,
=171.75;
(6)2.63×2.3+2.3+6.37×2.3,
=(2.63+1+6.37)×2.3,
=10×2.3,
=23.解析分析:(1)(6)运用乘法分配律简算;
(2)先算括号内的乘法,再算括号内的减法;
(3)先算括号内的,再算括号外的除法,最后算括号外的减法;
(4)运用除法的性质简算;
(5)先算括号内的,再算括号外的除法,最后算括号外的加法.点评:考查了小数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
=(99+1)×6.25,
=100×6.25,
=625;
(2)(5.6×0.3-0.68)÷0.25×4,
=(1.68-0.68)÷0.25×4,
=1÷0.25×4,
=4×4,
=16;
(3)6.9-(0.6+4.5)÷1.7,
=6.9-5.1÷1.7,
=6.9-3,
=3.9;
(4)7.2÷1.25÷0.8,
=7.2÷(1.25×0.8),
=7.2÷1,
=7.2;
(5)(25.5+17.25)÷0.25+0.75,
=42.75÷0.25+0.75,
=171+0.75,
=171.75;
(6)2.63×2.3+2.3+6.37×2.3,
=(2.63+1+6.37)×2.3,
=10×2.3,
=23.解析分析:(1)(6)运用乘法分配律简算;
(2)先算括号内的乘法,再算括号内的减法;
(3)先算括号内的,再算括号外的除法,最后算括号外的减法;
(4)运用除法的性质简算;
(5)先算括号内的,再算括号外的除法,最后算括号外的加法.点评:考查了小数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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- 1楼网友:一秋
- 2021-01-02 23:24
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