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y=2/x
w=x*x/2-x*4/x^2=(x^2)/2 - 4/x= (x^3-8)/2x
23 odp a bo :
a*6=b => a=b/6
0,5*a=c => c= 1/2* b/6 = b/12
22 odp a bo :
pole trapezu P= (x+y) * a/2
2*P/a=x+y
y= (2*P/a) - x
21
x/1> -1 1> -x -1 < x NIE
x^2 < 100 x<-10 lub x>10 TAK
2x > x 2x-x >0 x>0 NIE
x/(-10) < 1 x > -10 NIE