Question

hej zadanie jest w załączniku ttzeba rozwiązać 10,11,12

z góry więlkie dzieki

Answer 1

zad 10.

 

a) 0,7x +1i 1/5 = 4,5(1-1 i 2/5x) + 3

7/10x + 6/5= 45/10 (1- 7/5x)+3

7/10x+12/10= 45/10- 63/10x +3

70/10x= 33/10+3

70/10x=33/10 + 30/10

70/10x=63/10

7x=6,3     /:7

x=o,9

 

b) 4/5(4,5x-6)=-2(2/5x +1)+6+4,4x

8/10(45/10-60/10)= -10/5(2/5x +5/5)+60/10+ 44/10x

360/100x-480/100=4/5x-10/5+40/10+44/10x

36/10x-48/10=8/10x-20/10+60/10+44/10x

36/10x-48/10=52/10x+40/10

-16/10x= -8/10

-1.6x= -0,8      /: (-1,6)

x=0,5

 

c)2y +2/5(-1,2y-1) -18/25y =4(0,32y- 0,22)

2/1y+2/5(-1i 2/10y -1/1)-18/25y=1,28-0,88

2/1y+4/10(-12/10y-10/10)-18/25y=1,28-0,88

2/1y-48/100y-40/100-72/100y=1,28-0,88

200/100y-48/100y-40/100-72/100=1,28-0,88

80/100y-40/100=1,28-0,88

80/100y-40/100=1 i 28/100y-88/100

80/100y-40/100=128/100y-88/100

-48/100y=48/100

-0,48y=0,48      /: (-0,48)

y=-1

 

d) 0,8-1/5(0,3y-1)=1/25(y+25)+0,02y

8/10-2/10(3/10y-10/10)1/25y+1+0,02y

8/10-6/100-20/100=1/25y+1+2/100y

80/100-6/100y-20/100=4/100y+100+2/100y

60/100=12/100y+100

-12/100y=-60/100+10000/100

-12/100y=/100

-12/100y=9940/100

-0,12y=9,94      / :(-0,12)

y=-82,333333333....

 

zad 11.

a)a/2+2+a/2=3

2 i a/2+2=3

2 i a/2=1

 

b)3y/y-4/5=4/5y+1/5-y-1

3y/y-4/5y+y=4/5+1/5-1

3y-0,8y+y=5/5-1

3y+0,2y=0

3,2y=0   /:3.2

y=0

 

c) -x/3-0,4=3/5-(x+1/2)

-x/3+(x+1/2)=0,4+3/5

-2x/6+(3x+3/6)=0,4+0,6

(x+3/6)=1

x/2=1

 

zad 12.

a) (z-1/2)=4,6+3 i 1/2x

(z-1/2)=46/10+35/10x

 

b)7x/2+2x/3=11X+13 i 2/3

21x/6+4x/6=11X+13 i 2/3

25x/6-11X=13 i 2/3

25x/6-66x/6=13 i 2/3

-41x/6=13 i 2/3

 

c) 4/9X -2=5/12X-1 i 1/3

4/9X-5/12X=-1 i 1/3 +2

16/36X-15/36X=-4/3+2/1

X=-4/3+6/3

x=2/3

 

 

:)