1) 5.(-2) = -5.2 = -10
2) (-6).(-4) = 6.4 = 24
3) -23.1 = -23
4) (-2).(-8) = 2.8 = 16
5) 4.(-3) = -4.3 = -12
6) -3² = -9
7) (36 - 6) . (-5) + 6(-24 - 6)
= 30 . (-5) + 6 . (-30)
= -30.(5 + 6)
= -30.11
= -330
8) 2.(-28) - 8.(-7)
= -56 + 56
= 0
9) [16 - (-6)].(-5)
= (16 + 6).(-5)
= 22.(-5)
= -110
10) [(-4).(-5) - 6].[(-12) - (-5)]
= (20 - 6).(-7)
= -98
11) [-12 + (-5).3][(-6).2 + 12]
= (-12 - 15).(-12 + 12)
= -27.0
= 0
1: \(5\cdot\left(-2\right)=-\left(5\cdot2\right)=-10\)
2: \(\left(-6\right)\cdot\left(-4\right)=\left(-1\right)\cdot6\cdot\left(-1\right)\cdot4=6\cdot4=24\)
3: \(-23\cdot1=-\left(23\cdot1\right)=-23\)
4: \(\left(-2\right)\cdot\left(-8\right)=\left(-1\right)\cdot2\cdot\left(-1\right)\cdot8=2\cdot8=16\)
5: \(4\cdot\left(-3\right)=-\left(4\cdot3\right)=-12\)
6: \(-3^2=-\left(3^2\right)=-9\)
7: \(\left(36-6\right)\cdot\left(-5\right)+6\left(-24-6\right)\)
\(=30\cdot\left(-5\right)+6\cdot\left(-30\right)\)
\(=30\left(-5-6\right)\)
\(=-11\cdot30=-330\)
8: \(2\cdot\left(-28\right)-8\left(-7\right)\)
\(=-56+56\)
=0
9: \(\left[16-\left(-6\right)\right]\cdot\left(-5\right)\)
\(=-5\cdot\left(16+6\right)\)
\(=-5\cdot22=-110\)
10: \(\left[\left(-4\right)\left(-5\right)-6\right]\left[\left(-12\right)-\left(-5\right)\right]\)
\(=\left[20-6\right]\left[-12+5\right]\)
\(=-7\cdot14=-98\)
11: \(\left[-12+\left(-5\right)\cdot3\right]\left[\left(-6\right)\cdot2+12\right]\)
\(=\left[-12-15\right]\cdot\left(-12+12\right)\)
\(=-27\cdot0\)
=0
