\(47-63+53\cdot21+47\cdot37+53\cdot79\)
\(=47\cdot\left(1+37\right)-63+53\cdot\left(21+79\right)\)
\(=47\cdot38-63+53\cdot100\)
\(=1786-63+5300\)
\(=7023\)
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47.63+53.21+47.37+53.79
=47.63+47.37+53.21+53.79
=47.(63+37)+53.(21+79)
=47.100+53.100
=100.(47+53)
=100.100
=10000
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