187×4.2+81.3×42简便运算?
4个回答
2022-08-08
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187×4.2+81.3×42
=18.7×42+81.3×42
=(18.7+81.3)×42
=100×42
=4200
=18.7×42+81.3×42
=(18.7+81.3)×42
=100×42
=4200
展开全部
187*4.2+81.3*42
=187*4.2+813*4.2
=4.2(187+813)
=4.2*1000
=4200
=187*4.2+813*4.2
=4.2(187+813)
=4.2*1000
=4200
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展开全部
首先要知道
187×4.2
=18.7×10×4.2
=18.7×42
那么
187×4.2+81.3×42
=18.7×42+81.3×42
=42×(18.7+81.3)
=42×100
=4200
187×4.2
=18.7×10×4.2
=18.7×42
那么
187×4.2+81.3×42
=18.7×42+81.3×42
=42×(18.7+81.3)
=42×100
=4200
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展开全部
187x4.2+81.3x42
=18.7x(10x4.2)+81.3x42
=18.7x42+81.3x42
=(18.7+81.3)x42
=100x42
=4200
=18.7x(10x4.2)+81.3x42
=18.7x42+81.3x42
=(18.7+81.3)x42
=100x42
=4200
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