Question

ex 8 rezolvare completa ca sa le inteleg. plsss

Answer 1

a) 18*17+18*(-10)-18*6
=18(17-10-6)=
=18*1=
=18

b)-5*61-5*9=
=-5(61+9)=
=-5*70=
=-350

c)-6*(-14)+(-6)*81-(-6)*7=
=-6(-14+81-7)=
=-6*60=
=-360

d)20*(-91)+20*17-20*4=
=20(-91+17-4)=
=20*(-78)=
=-1560

e)-15*(-80)-15*69-15*(-29)=
=-15(-80+69-29)=
=-15*(-40)=
=600

Regula semnelor:
"+" * "+"="+"
"+" * "-"="-"
"-" * "-"="+"

Answer 2

18 * 17 + 18 * ( - 10 ) - 18 * 6

18 se repeta si este comun deci

18 [ 17 + (-10) - 6 ) =

18 * ( 17 - 10 - 6 )

18 * 1 = 18

b) -5 * ( 61 + 9 ) =

-5 * 70 = - 350

c) -6* ( - 14 + 81 - 7 ) =

-6 * 60 = - 360

d) 20 * ( - 91 + 17 - 4 )

20 * ( -78) = - 1560

e) - 15 * ( -80 + 69 - 29 ) =

-15 * (-40) = 600