题目内容
计算下面各题,怎样简便就怎样计算.
0.75×3.6×10.7
5.06×(2.08÷5.2)
4.8×0.7÷4.8
24.6÷2.5÷0.4.
解:0.75×3.6×10.7,
=2.7×10.7,
=28.89;
5.06×(2.08÷5.2),
=5.06×0.4,
=2.024;
4.8×0.7÷4.8,
=4.8÷4.8×0.7,
=1×0.7,
=0.7;
24.6÷2.5÷0.4,
=24.6÷(2.5×0.4),
=24.6÷1
=24.6.
分析:(1)从左往右依次计算即可求解;
(2)先算括号里面的乘法,再算括号外面的乘法;
(3)将式子变形为4.8÷4.8×0.7,简便计算即可;
(4)根据连除的简算方法计算即可.
点评:考查了小数四则混合运算,解题的关键是按照顺序正确进行计算,并且灵活运用运算律简便计算.
=2.7×10.7,
=28.89;
5.06×(2.08÷5.2),
=5.06×0.4,
=2.024;
4.8×0.7÷4.8,
=4.8÷4.8×0.7,
=1×0.7,
=0.7;
24.6÷2.5÷0.4,
=24.6÷(2.5×0.4),
=24.6÷1
=24.6.
分析:(1)从左往右依次计算即可求解;
(2)先算括号里面的乘法,再算括号外面的乘法;
(3)将式子变形为4.8÷4.8×0.7,简便计算即可;
(4)根据连除的简算方法计算即可.
点评:考查了小数四则混合运算,解题的关键是按照顺序正确进行计算,并且灵活运用运算律简便计算.
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