问题 解答题

脱式计算

25×(8+4)

0.25+3.64+1.75+6.36

360÷2.5÷4

25×12-12×5.

答案

(1)25×(8+4),

=25×12,

=25×4×3,

=100×3,

=300;

(2)0.25+3.64+1.75+6.36,

=(0.25+1.75)+(6.36+3.64),

=2+10,

=12;

(3)360÷2.5÷4,

=360÷(2.5×4),

=360÷10,

=36;

(4)25×12-12×5,

=(25-5)×12,

=20×12,

=240.

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