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A.
{x=y-1
{x+2y-2x-3=-x
x=y-1
x-2x+x+2y=3
x=y-1
2y=3
x=y-1
y=3/2
x=3/2-1
y=3/2
x=1/2
y=3/2
B.
{x+2y-3=0
{x-2y+2x-3=-1
x=-2y+3
-2y+3-2y+2*(-2y+3)-3=-1
x=-2y+3
-4y-4y+6=-1
x=-2y+3
-8y=-7
x=-2y+3
y=7/8
x=-2*7/8+3
y=7/r8
x=-7/4+3
y=7/8
x=5/4
y=7/8
2.
wyznacz ze wzoru każdą z niewiadomych.
A.
s=vt
v=s/t
t=s/v
B.
R=U/I
U=RI
I=U/R
C.
1/x=1/f1+1/f2
1=x(1/f1+1/f2)
x=1/(1/f1+1/f2)
f1=1/(1/x-1/f2)
f2=1/(1/x-1/f1)