8.4×0.25+0.75的简便方法?
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答:
8.4×0.25+0.75
=2.1×4×0.25+0.75
=2.1×(4×0.25)+0.75
=2.1×1+0.75
=2.1+0.75
=2.85
8.4×0.25+0.75
=2.1×4×0.25+0.75
=2.1×(4×0.25)+0.75
=2.1×1+0.75
=2.1+0.75
=2.85
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