问题
解答题
0.25×19+0.75×27.
答案
0.25×19+0.75×27,
=0.25×19+(0.25×3)×27,
=0.25×19+0.25×81,
=0.25×(19+81),
=0.25×100,
=25.
0.25×19+0.75×27.
0.25×19+0.75×27,
=0.25×19+(0.25×3)×27,
=0.25×19+0.25×81,
=0.25×(19+81),
=0.25×100,
=25.