41.2×8.1+21×1点25+53.7×1点九简便运算？
2个回答
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41.2×8.1+21×1.25+53.7×1.9的简便运算是
=41.2×8.1+53.7×1.9+21×1.25
=41.2×8.1+(41.2+12.5)×1.9+21×1.25
=41.2×8.1+41.2×1.9+12.5×1.9+21×1.25
=41.2×(8.1+1.9)+1.25×19+21×1.25
=41.2×10+1.25×(19+21)
=412+1.25×40
=412+50
=462
=41.2×8.1+53.7×1.9+21×1.25
=41.2×8.1+(41.2+12.5)×1.9+21×1.25
=41.2×8.1+41.2×1.9+12.5×1.9+21×1.25
=41.2×(8.1+1.9)+1.25×19+21×1.25
=41.2×10+1.25×(19+21)
=412+1.25×40
=412+50
=462
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=41.2×8.1+53.7×1.9+21×1.25
=333.72+1020.3+26.25
=1354.02+26.25
=1380.27
=333.72+1020.3+26.25
=1354.02+26.25
=1380.27
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