- 13 = 1 . ( - 13 )
6 = ( - 2 ) . ( - 3 )
- 15 = ( - 3 ) . 5
- 18 = 2.( - 9 )
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\(-13=\left(-1\right).13=1.\left(-13\right)\)
\(6=2.3=1.6=\left(-2\right).\left(-3\right)=\left(-1\right).\left(-6\right)\)
\(-15=\left(-3\right).5=3.\left(-5\right)=1.\left(-15\right)=\left(-1\right).15\)
\(-18=\left(-1\right).18=1.\left(-18\right)=2.\left(-9\right)=\left(-2\right).9=2.3.\left(-3\right)\) \(=2.\left(-3\right).3=\left(-2\right).3.3\)