85.6×42+856×6.8-856的简便运算(算式)

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85.6×42+856×6.8-856的简便运算(算式)
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85.6×42+856×6.8-856的简便运算(算式)
85.6×42+856×6.8-856的简便运算(算式)

85.6×42+856×6.8-856的简便运算(算式)
85.6×42+856×6.8-856
=856×4.2+856×6.8-856
=856×(4.2+6.8-1)
=856×10
=8560