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.

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