Question

Zad 1.

Oblicz sumy:

a)(-8)+(-5)+4

49+(-15)+(-17)

(-29)+48+(-32)

Zad 2

a)2/9+(-1/3)

-3/10 + 8/15

(-2 i 2/7)+(-3 i 4/5)

(-7 i 1/6)+2 i 2/3

Zad 3

a)9-15 i 1/4

b)8 i 2/7 - 10

c)-5/8-3/4

d)2 i 2/5 -7 i 1/2

e) 4,9- 7 i 3/5

f) -3,4-3/4

g)-5,1-(-2 i 1/8)

h)-7 i 5/6 -(-15,2)

i)-16,8+4,9-7,4

j)-5 i 1/2-(-4 i 2/3)-11 i 5/6

k) 11-3,8-(-7 i 3/5)

l)-9 i 2/9-(-14 i 1/6)-1 i 1/3

PROSZE O,, DOKŁADNE'' OBLICZENIA! TO WAŻNE!

Answer 1

a) Oblicz sumy:

a)(-8)+(-5)+4 = -13 + 4 = -9

 

49+(-15)+(-17) = 49 + (-32) = 17

(-29)+48+(-32) = 19 + (-32) = -13

Zad 2
a) 2/9+(-1/3) = 2/9 + (- 3/9) = - 1/9

-3/10 + 8/15 = - 9/30 + 16/30 = 7/30

(-2 i 2/7)+(-3 i 4/5) = (- 16/7) + (-19/5) = ( - 80/35) + (-133/35) = - 213/35 = 6 i 3/35

 

 (-7 i 1/6)+2 i 2/3 = (-43/6) + 8/3 = (-43/6) + 16/6 = - 27/6 = - 4 i 1/3

 

 Zad 3



a)9-15 i 1/4 = 9 - 61/4 = 9/1 - 61/4 = 36/4 - 61/4 = - 25/4 = - 6 i 1/4

b)8 i 2/7 - 10 = 58/7 - 10 = 58/7 - 10/1 = 58/7 - 70/7 = - 12/7 = - 1 i 5/7

c)-5/8-3/4 = -5/8 - 6/8 = - 11/8 = - 1 i 3/8

d)2 i 2/5 -7 i 1/2 = 12/5 - 15/7 = 84/35 - 75/35 = 9/35

e) 4,9- 7 i 3/5 = 4 i 9/10 - 7 i 3/5 = 49/10 - 38/5 = 49/10 - 76/10 = - 27/10 = - 2 i 7/10

f) -3,4-3/4 = - 3,4 - 0,75 = - 2,65

g)-5,1-(-2 i 1/8) = - 5 i 1/10 - (- 2 i 1/8) = - 51/10 + 17/8 = - 204/40 + 170/40 = - 34/40

h)-7 i 5/6 -(-15,2) = - 47/6 + 15 i 2/10 = - 47/6 + 152/10 = -470/60 + 912/60 = 442/60 = 7 i 22/60 = 7 i 11/30

i)-16,8+4,9-7,4 = -11,9 - 7,4 = - 19,3

j)-5 i 1/2-(-4 i 2/3)-11 i 5/6 = - 11/2 + 14/3 - 71/6 = - 33/6 + 28/6 - 71/6 = - 5/6 - 71/6 = -76/6 = - 12 i 4/6 = - 12 i 2/3

k) 11-3,8-(-7 i 3/5) = 7,2 + 7 i 3/5 = 7 i 2/10 + 38/5 = 72/10 + 38/5 = 72/10 + 76/10 = 148/10 = 14 i 8/10 = 14 i 4/5

l)-9 i 2/9-(-14 i 1/6)-1 i 1/3 = -83/9 + 85/6 - 4/3 = - 332/36 + 510/36 - 48/36 = 130/36 = 3 i 22/36 = 3 i 11/18

 

Answer 2

1.

a)(-8)+(-5)+4 = (-8)-5+4=-9

49+(-15)+(-17)=49-15-17=17

(-29)+48+(-32)=6

 

2.

a)2/9+(-1/3)= 2/9-1/3= 2/9-3/9=-1/3

-3/10 + 8/15= -9/30-16/30= -5/6

(-2 2/7)+(-3 4/5)= -16/7-19/5=80/35-133/35=-53/35=-1 18/35

(-7 i 1/6)+2 i 2/3=-43/6+8/3=-43/6+16/6=-27/6=-4 1/2

 

3.

a)9-15 i 1/4= 9-61/4=9-15,25=-6,25

b)8 i 2/7 - 10= 58/7-10=8,29-10=-1,71

c)-5/8-3/4=  -5/8-6/8= -11/8= -1 3/8

d)2 i 2/5 -7 i 1/2= 12/5-15/2= 24/10-25/10= -51/10= -5,1

e) 4,9- 7 i 3/5= 4,9- 7,6= -2,7

f) -3,4-3/4= -3,4-0,75= -4,15

g)-5,1-(-2 i 1/8)= -5,1+17/8= -5,1+2,125=-2,975

h)-7 i 5/6 -(-15,2)= -40/6 + 15,2= -6,67+15,2=8,53

i)-16,8+4,9-7,4= -19,3

j)-5 i 1/2-(-4 i 2/3)-11 i 5/6=  -11/2-14/3+71/6=-33/6-28/6+71/6= 10/6= 1 2/3

k) 11-3,8-(-7 i 3/5)= 11-3,8-7,6= -0,4

l)-9 i 2/9-(-14 i 1/6)-1 i 1/3= -83/9 -85/6- 4/3= -332/36-510/36-48/36=-890/36= -24 i 26/36