(1)(30-24)÷24
=0.25
=25%;
(2)140÷(1+40%)
=140÷1.4
=100(千克);
(3)5×(1-20%)
=5×0.8
=4(千克);
(4)(5-3)÷5
=0.4
=40%;
故答案为:25,100,4,40.
(1)(30-24)÷24
=0.25
=25%;
(2)140÷(1+40%)
=140÷1.4
=100(千克);
(3)5×(1-20%)
=5×0.8
=4(千克);
(4)(5-3)÷5
=0.4
=40%;
故答案为:25,100,4,40.