2.5乘6.7加22.1乘0.9简便
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2.5×6.7+22.1×0.9
=67×0.25+22.1-22.1×0.1
=67/4+22.1-2.21
=33.5/2+20.1-0.21
=16.75+20-0.11
=36.64
=67×0.25+22.1-22.1×0.1
=67/4+22.1-2.21
=33.5/2+20.1-0.21
=16.75+20-0.11
=36.64
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展开全部
=2.5×6+2.5×0.7+22.1×1-22.1×0.1
=15+1.75+22.1-2.21
=67.1-0.46
=66.64
=15+1.75+22.1-2.21
=67.1-0.46
=66.64
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