题目内容
0.25×43+0.75×19=________.
25
分析:先根据积不变的性质将式子变形为0.25×43+0.25×57,再根据乘法分配律简便计算即可.
解答:0.25×43+0.75×19,
=0.25×43+0.25×57,
=0.25×(43+57),
=0.25×100,
=25.
故答案为:25.
点评:考查了小数四则混合运算,本题关键是将式子变形为0.25×43+0.25×57,灵活运用运算律简便计算.
分析:先根据积不变的性质将式子变形为0.25×43+0.25×57,再根据乘法分配律简便计算即可.
解答:0.25×43+0.75×19,
=0.25×43+0.25×57,
=0.25×(43+57),
=0.25×100,
=25.
故答案为:25.
点评:考查了小数四则混合运算,本题关键是将式子变形为0.25×43+0.25×57,灵活运用运算律简便计算.
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