解：原式=5-4.19+2.83
=5+2.83-4.19
=7.83-4.19
=7-4+(0.83-0.19)
=3+0.64
=3.64
=5+2.83-4.19
=7.83-4.19
=7-4+(0.83-0.19)
=3+0.64
=3.64
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第1个回答 2020-02-26
5-（4.19-2.83）
=5-4-0.19+2+0.83
=3-0.2+0.01+0.83
=3+0.64=3.64
=5-4-0.19+2+0.83
=3-0.2+0.01+0.83
=3+0.64=3.64
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