77+2.7+2.8+25的简便方法怎么算？
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77+2.7+2.8+25
=75+2+2.7+2.3+0.5+25
=75+25+2.7+2.3+2+0.5
=100+5+2+0.5
=107.5
=75+2+2.7+2.3+0.5+25
=75+25+2.7+2.3+2+0.5
=100+5+2+0.5
=107.5
追答
77看成75与2的和。
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展开全部
77+2.7+2.8+25
=(77+25)+(2.7+2.8)
=102+5.5
=107.5
=(77+25)+(2.7+2.8)
=102+5.5
=107.5
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