简便运算540*54+460*45
540×54+460×45
=540×45+540×9+460×45
=(540+460)×45+540×9
=1000×45+4860
=45000+4860
=49860追问
=540×45+540×9+460×45
=(540+460)×45+540×9
=1000×45+4860
=45000+4860
=49860追问
450*54+460*45
450*54+460*45
450*54+460*45
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