0.52×43+1.04+47×0.8,简便运算怎么算?
2个回答
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0.52×43+1.04+47×0.8
=0.52×43+0.52×2+47×0.8
=0.52×(43+2)+47×0.8
=0.52×45+47×0.8
=0.52×45+(45+2)×0.8
=0.52×45+0.8×45+2×0.8
=45×(0.52+0.8)+1.6
=45×1.32+1.6
=45×4×0.33+1.6
=180×0.33+1.6
=180×0.3×1.1+1.6
=54×1.1+1.6
=54×(1+0.1)+1.6
=54+5.4+1.6
=54+(5.4+1.6)
=54+7
=61
=0.52×43+0.52×2+47×0.8
=0.52×(43+2)+47×0.8
=0.52×45+47×0.8
=0.52×45+(45+2)×0.8
=0.52×45+0.8×45+2×0.8
=45×(0.52+0.8)+1.6
=45×1.32+1.6
=45×4×0.33+1.6
=180×0.33+1.6
=180×0.3×1.1+1.6
=54×1.1+1.6
=54×(1+0.1)+1.6
=54+5.4+1.6
=54+(5.4+1.6)
=54+7
=61
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