9. (-2,5).(-4)
=10
10. (-0,5).0,5.(-2).2
=[(-0,5).(-2)].[0,5.2]
=1.1=1
11.(-2,5).(-7).(-4)
=[(-2,5).(-4)].(-7)
=10.(-7)=-70
12.(-0,5).5.(-50).0,02.(-0,2).2
=[(-0,5).(-0,2)].[5.0,02].[(-50).2]
=0,1.0.1.(-100)
=-1
13. 25.(-5).(-0,4).(-0.2)
=[25.(-0,4)].[(-5).(-0.2)]
=-10.1
=-10
14. (-2,5.0,375.0,4)-[-0.125.3,25.(-8)]
=(-2,5.0,4.0,375)-[-0.125.(-8).3,25]
=(-1.0,375)-[1.3,5]
=-0,375-3,5
=-3,125
15. /157,35-255,75/+/244,25-142,65/
=/-98,4/+/1,6/
=98,4+1,6
=100