Question

Zad. 1 Wpisz brakujące czynniki.

a) -2 x ? x 5 x ? x (-1) = 320

b) -2 x ? x 5 x ? x (-1) = - 160

c) ? x (-1) x ? x 2 x ? x (-1) = - 72

Zad. 2 Oblicz .

a) - ⅚ x ( -1½ ) x ⅖ = ?

b) - 2½ : (-1¼ ) x ( -¾ ) = ?

Answer 1

a) -2 x 2 x 5 x 16 x (-1) = 320

b) -2 x (-8) x 5 x 2 x (-1) = - 160

c) 4 x (-1) x 3 x 2 x (-3) x (-1) = - 72

 

 

a) - ⅚ x ( -1½ ) x ⅖ = -5/6*(-3/2)*2/5=1/2

b) - 2½ : (-1¼ ) x ( -¾ ) = -5/2*(-4/5)*(-3/4)=-3/2

 

Answer 2

O ILE "x" to znak mnożenia, to:

 

a) -2*8*5*4*(-1)=320

b)-2*4*5*(-4)*(-1)=-160

c) 3*(-1)*2*2*(-6)*(-1)=-72

 

zad.2

a)- ⅚ x ( -1½ ) x ⅖ = -5/6 * (-3/2)*2/5=5/4*2/5=1/2*1=0,5

b) - 2½ : (-1¼ ) x ( -¾ ) = -5/2:(-5/4)*(-3/4)=-5/2*(-4/5)*(-3/4)+2*(-3/4)=1*(-3/2)=-1,5