14.2×24-28.4×2--4---(+)---(-)+-.
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解:(1)++
=+,
=1;
(2)14.2×24-28.4×2
=14.2×24-14.2×2×2,
=14.2×(24-4),
=14.2×20,
=284;
(3)+++
=(+)+(+),
=1+1,
=2;
(4)--
=-,
=0;
(5)4--,
=4-(+),
=4-1,
=3;
(6)-(+)
=-,
=;
(7)--,
=-(+),
=-1,
=;
(8)-(-)
=-,
=;
(9)+-
=+(-),
=+,
=1.
解析分析:(1)(4)(6)(8)按照分数加减法的计算方法进行计算即可得到