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b)21*(-4)-(-5)*21=-84-(-105)=-84+105=21
c)13*(-15)+(-15)*(-12)=-195+180=-15
d)16 : (-2) - 4 : (-2)=-8-(-2)=-8+2=-6
e)9:(-3)-(-15):(-3)=-3-5=-8
f)-18: (-3) + (-21):3=6+(-7)=-1
zad.2 Oblicz.
a) (-4)+(-4)*(-2) - (-12)=-4+8+12=4+12=16
b)[8-8*(-4)-12*(-3)]*(-2)=[8-(-36)-(-36)]*(-2)=(8+36+36)*(-2)=80*(-2)=-160
c)(-34)+(-6)*[2-(-3)*4]=(-34)+(-6)*[2-(-12)]=-34+(-6)*[2+12]=-34+(-6)*14=-34+(-84)=-118
d){4-[-(-6)*(-3)+3]-13}*(-4)={4-[-18+3]-13}*-4={4-(-15)-13}*-4=4+15-13}*-4=6*-4=-24
zad.3
a)0,2*(-4)-0,2*(-8)=(-0,8)-(-1,6)=-0,8+1,6=0,8
b)(-6)*0,28-0,24*(-6)=-1,68-(-1,44)=-1,68+1,44=-0,24
c) 4*(1/3)-(-1/3)*(-5,6)=4/3-(-1/3)*(-56/10)=4/3-56/30=40/30-56/30=-16/30
d)(-5/8)*1,4*1/4*1,4=(-5/8)*14/10*1/4*14/10=-70/80*14/40=-7/8*14/40=-98/320=-49/160
e)3/4*(-0,6)-0,6*0,25=0,75*(-0,6)-0,6*0,25=-0,45-0,15=-0,6
f)(-1,2)*1/3-(-2/3)*0,6=-12/10*1/3-(-2/3)*6/10=-12/30-(-12/30)=-12/30+12/30=0