Question

a ) -1/2 x 4/5 - (-0,8) x 5/6 = ?

b) 1-(1 - 2/3) x (2/3 - 1)

c) 2.25 x (-1,6) + (-19.5) : (-2 1/2) =

1/2 = jedna druga

5/6 = pięć szustych

2/3 = dwie trzecie

Answer 1

a)-1/2x4/5-(-0,8)x5/6=-4/10-(-4/5)x5/6=-4/10-(-20/30)=-2/5+2/3=-6/15+10/15=4/15

b)1-(1-2/3)x(2/3-1)=1-1/3x(-1/3)=1+1/6=1 1/6

c)2,25x(-1,6)+(-19,5):(-2 1/2)=3,6+(-19.5):(-2,5)=3,6+7,8=11,4 

Answer 2

a)

-1/2*4/5+8/10*5/6

-4/10+8/10*5/6=-4/10+40/60=-24/60+40/60=16/60=4/15

b)

1-(1-2/3)*(2/3-1)=1-1/3*(-1/3)=1+1/9=1 i 1/9

c)

2,25*(-1,6)+(-19,5):(-2,5)=-3,6+7,8=4,2