问题
解答题
①25.74-2.36-7.64 ②0.75×0.25×4
③8.4÷0.25÷4 ④2.8×3.6+1.4×2.8.
答案
①25.74-2.36-7.64,
=25.74-(2.36+7.64),
=25.74-10,
=15.74;
②0.75×0.25×4,
=0.75×(0.25×4),
=0.75×1,
=0.75;
③8.4÷0.25÷4,
=8.4÷(0.25×4),
=8.4÷1,
=8.4;
④2.8×3.6+1.4×2.8,
=2.8×(3.6+1.4),
=2.8×5,
=14.