Question

Tylko 2 równania z matematyki

Answer 1

1]
(-x+y) /2  + (5x-y) /3  = (7x-3y) /5    /*30
3/(y+1) = 5/( x-1)

15(-x+y)+10(5x-y)=6(7x-3y)
3(x-1)=5(y+1)

-15x+15y+50x-10y=42x-18y
3x-3=5y+5

35x-42x=-18y-5y
3x=5y+8

-7x=-23y  /;(-1)
x=5/3y+8/3

7(5/3y+8/3) =23y
35/3y+56/3=23y    /*3
35y+56=69y
69y-35y=56
34y=56
y=56/34=28/17
x=5/3*28/17+8/3=140/51+8/3=140/51+136/51=276/51=92/17
spr.
(-92/17+28/17)/2+(5*92/17-28/17)/3=(7*92/17-3*28/17)/5
-32/17+144/17=112/17
112/17=112/17
3/(28/17+1)=5/(92/17-1)
3*75/17=5*45/17
225/17=225/17
odp. ;
x=92/17
y=28/17
2]
=
3[ 2x-1/3y-1]=-2y+6x
2*[ 3x-3y-9/4]=-6y+3x

6x-y-3=-2y+6x
6x-6y-9/2=-6y+3x

-y+2y=3
6x-3x=9/2

y=3
3x=4,5

x=1,5
y=3
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spr/
pierwsze równanie;
3[ 2(1,5-1/6*3)-1]=-2(3-3*1,5)
3[3-1-1]=-2*(-1,5)
3=3
drugie;
2*[3(1,5-3)-2,25]=-3(2*3-1,5)
2[-4,5-2,25]=-3*4,5
-13,5=-13,5
odp.
x=1,5
y=3