题目内容
5×1.3÷5×1.3
99×10.1
58×10.1-5.8
128.8÷23+9.2×0.35.
解:(1)5×1.3÷5×1.3,
=6.5÷5×1.3,
=1.3×1.3,
=1.69;
(2)99×10.1,
=99×10+99×0.1,
=990+9.9,
=999.9;
(3)58×10.1-5.8,
=(10.1-0.1)×5.8,
=10×5.8,
=58;
(4)128.8÷23+9.2×0.35,
=5.6+3.22,
=8.82.
分析:(1)按照从左到右顺序计算即可解答,
(2)(3)运用乘法分配律解答,
(4)按照先同时计算除法和乘法,再算加法的顺序即可解答.
点评:本题考查知识点:(1)依据四则运算计算方法正确进行计算,(2)正确运用简便算法解决问题.
=6.5÷5×1.3,
=1.3×1.3,
=1.69;
(2)99×10.1,
=99×10+99×0.1,
=990+9.9,
=999.9;
(3)58×10.1-5.8,
=(10.1-0.1)×5.8,
=10×5.8,
=58;
(4)128.8÷23+9.2×0.35,
=5.6+3.22,
=8.82.
分析:(1)按照从左到右顺序计算即可解答,
(2)(3)运用乘法分配律解答,
(4)按照先同时计算除法和乘法,再算加法的顺序即可解答.
点评:本题考查知识点:(1)依据四则运算计算方法正确进行计算,(2)正确运用简便算法解决问题.
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