\(5.2,9+3,7-\left(-4,2\right)+15.\left(-2,9\right).4,2\)
\(=5.2,9+3,7+4,2+15.\left(-2,9\right).4,2\)
\(=14,5+3,7+4,2-182,7\)
\(=14,5+4,2+3,7-182,7\)
\(=22,4-182,7\)
\(=\left(-160,3\right)\)
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\(5.2,9+3,7-\left(-4,2\right)+15.\left(-2,9\right).4,2\)
\(\left(5.2,9\right)+\left[3,7-\left(-4,2\right)\right]+\left[15.\left(-2,9\right)\right].4,2\)
\(=14,5+7,9+\left(-43,5\right).4,2\)
\(=\left(14,5+7,9\right)+\left[\left(-43,5\right).4,2\right]\)
\(=22,4+\left(-182,7\right)\)
\(=\left(-160,3\right)\)
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