15 : (-3) + (-7) . (-2) - (-20) : (-5)
= (-5) + 14 - 4
= 9 - 4
= 5
\(\text{15:(-3)+(-7).(-2)-(-20):(-5)}\)
\(=-5+14-4\)
\(=9-4\)
= 5
Ta có: \(15:\left(-3\right)+\left(-7\right)\cdot\left(-2\right)-\left(-20\right):\left(-5\right)\)
\(=-5+14-20:5\)
\(=9-4=5\)