Question

Zadanie w załączniku plis daje naj !!!!!!!!!

Answer 1

zad1

x*y+5

12%*k

x+25%x

zad2

a)

b) 2(5x-7y)-(3y-7x)=10x-12y-3y+7x=17x-15y

c) (5+2x)(3x-2)=15x-10+6x^2-4x=11x-10+6x^2

d) 2x(4x-1)-(x-2)(x+2)=8x^2-2x-x^2-2x-4=7x^2-8x-4

zad.3

p=4x*3

p=12x

zad.4

a/2+2>a

(2+x)(x-3)=x²

zad.5

a) 2x+2(3x+1)=10

2x+6x+2=10

8x=8/8

x=1

b) x/3-x/2=2       /*6

2x-3x=12

-x=12

x= -12

c) (x-2)(x+3)=x²

x²+3x-2x-6=x²

x²+3x-2x-x²=6

x=6

zad6

a) 2(c=1)=3a

2c=1=3a

2c=3a-1

c=3a-1/2

b) 2/c=a/4+b/4

c=a/4*½+b/4*½

c=a/8+b/8

c)1/a-3-2c=2/c

1/a*½-3/2c*½=2/c*½

1/2a-3/4c=c

zad7

x-kieszonowe

⅓x - sodycze

⅖x-kino

1/10x - zeszyty

5 - napoje

⅓x+⅖x+1/10x+5=x

5/15x+6/15x+1/10x+5=x

11/15x+1/10x+5=x

110/150x+15/150x+5=x

125/150x+5=x

125/150x-x= -5

-25/150x= -5

x=30

zad.8

6(2y+7)=12y+12

zad9

x+y/2-x/3=4

x-y/2+y/3= -3

3x+3y-2x=24

3x-3y+2y= -18

x+3y=24

3x-y= -18

x+3y=24

9x-3y= -54

10x=30

x=3

x+3y=24

3+3y=24

3y-27

y=9

x=3

y=9

zad10

a) x+5y=8

2x-y=5

x+5y=8

10x-5y=25

11x=33

x=3

x+5y=8

3+5y=8

5y=5

y=1

x=3

y=1

b)x-y=3

3(x-2)=2x+y

x-y=3

3x-6=2x+y

x-y=3

3x-2x-y=6

x-y=3

x-y=6

-x+y= -3

x-y=6

0=3

rownania sprzeczne