Question

Zad.1 a) (1,125 - 7/8) ÷ (-0,5)=
b) (3/8 - 0,875) · 10,2=
c) (3 2/25 - 2,06) ÷ (-0,3) =
d) (7 1/20 - 8,55) · (-2,2)=

g) - 12 - - [ 3-2 x 9 -14 +5)]=

h)[10x(-2)-7x3]x(-4)=

i)[-24:(-6)-7x4]:9-12)=

j) [-15x(-5)+10x(-3)]:9=

k)[3x(-9)=2x(-11)]x(-2)=

l) -4x(-5)+2x(-7)

_______________

5-8:4

m) -42 :(-6)-7x2

_________________-

15:(-3):5

n) 35:(-7)x(-2)

_________________

-18:(-6)+16:(-2)

o) 2x(-3)+15

______________

-4x2-1

Zad. 2

a) 7/12-5/18

b) 1 1/8 - 2 3/4

e) 6/7 x 1 3/4

f 2 2/5 x ( - 1 2/3)

Answer 1

zad.1

a) -0,5

b) - 5,1

c)6,44

d)19,165

g) 12

h)64

i)-14,67

j)5

Answer 2

Zad. 1

a)  (1,125 - 7/8) ÷ (-0,5)= (1 1/8 - 7/8) / (-1/2) = (9/8 - 7/8) / (-1/2) = 2/8 / (-1/2) =  2/8 * (-2) = 2/4 = 1/2

b) (3/8 - 0,875) · 10,2= (3/8 - 7/8) * 10 1/5 = - 4/8 * 51/5= -1/2 * 51/5 = 51/10 = 5,1

c) (3 2/25 - 2,06) ÷ (-0,3) = (77/25 - 2 3/10) / (- 3/10) = (77/25 - 103/50) / (-3/10) = (154/50 - 103/50) / (-3/10) = 51/50 * (- 10/3) = 17/5 = 3 2/5

d) (7 1/20 - 8,55) · (-2,2)= (7,05 - 8,55) * (-2,2) = - 1,5 * (- 2,2) = 3,3

g) - 12 - [ 3-2 x 9 -14 +5)]= -12 - 1 = -13

h)[10x(-2)-7x3]x(-4)= [ -20 - 21] * (-4) = -41 * (-4) = 164

i)[-24:(-6)-7x4]:9-12)= [ 4 - 28] /9 -12 = -24 - 3 = 8

j) [-15x(-5)+10x(-3)]:9=  [ 75 - 30] / 9 = 45 / 9 = 5

k)[3x(-9)=2x(-11)]x(-2)= [ -27 + 22] * (-2) = -5 * (-2) = 10

 l)  -4x(-5)+2x(-7)
   ______________   = 20 - 14 / 5 -2 = 6 / 3 = 2
         5-8:4

 m) -42 :(-6)-7x2
    ______________ = 7 - 14 / -5 / 5 = -7 / -1 = 7
       15:(-3):5

 n)  35:(-7)x(-2) 
   ______________ = -5 * (-2) / 3 - 8 = 10 / -5 = -2
   -18:(-6)+16:(-2)

 o) 2x(-3)+15
   ___________ = - 16 + 15 / -8  1 = 9 / -9 = -1
     -4x2-1

 Zad. 2

 a) 7/12-5/18 = 126/216 - 60/216 = 66/216 = 11/36

 b) 1 1/8 - 2 3/4 = 9 / 8 - 11/4 = 9/8 - 22/8 = -13/8 = - 1 5/8

 e) 6/7 x 1 3/4 = 6 /7 * 7/4 = 3/2 = 1 1/2

 f) 2 2/5 x ( - 1 2/3) = 12 / 5 * ( - 5/3) = -4