5.45ⅹ2.9+5.25简便方法?
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解: 5.45X2.9+5.25
= 5.45X(3-0.1)+5.25
= 5.45X3-0.545+5.25
=16.35+5.25-0.545
=21.6-0.545
= 21.055
= 5.45X(3-0.1)+5.25
= 5.45X3-0.545+5.25
=16.35+5.25-0.545
=21.6-0.545
= 21.055
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5.45×2.9+5.25
=(5.25+0.2)×2.9+5.25
=5.25×2.9+5.25+0.2×2.9
本题应该是54.5×2.9+5.25
=5.45×29+5.25
=(5.25+0.2)×29+5.25
=5.25×(29+1)+0.2×29
=5.25×30+5.8
=157.5+5.8
=163.3
=(5.25+0.2)×2.9+5.25
=5.25×2.9+5.25+0.2×2.9
本题应该是54.5×2.9+5.25
=5.45×29+5.25
=(5.25+0.2)×29+5.25
=5.25×(29+1)+0.2×29
=5.25×30+5.8
=157.5+5.8
=163.3
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