8 x 427 x 3 + 6 x 573 x 4
= 8 x 3 x 427 + 6 x 4 x 573
= 24 x 427 + 24 x 573
= 24 x (427 + 573)
= 24 x 1000
= 24000
2008 x 867 + 2009 x 133
= 2008 x 867 + 2008 x 133 + 133
= 2008 x (867 + 133) + 133
= 2008 x 1000 + 133
= 2008133
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a) \(8x427x3+6x573x4\)
\(=8x3x427+6x4x573\)
\(=24x427+24x573\)
\(=24x\left(427+573\right)\)
\(=24x1000\)
\(=24000\)
b) \(2008x867+2009x133\)
\(=2008x867+\left(2008+1\right)x133\)
\(=2008x867+2008x133+133\)
\(=2008x\left(867+133\right)+133\)
\(=2008x1000+133\)
\(=2008000+133\)
\(=2008133\)
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