4^2-3*4+c=0
16-12+c=0
c=-4
x^2-3x-4=0
D=9+16=25
x=(3+5)/2=4
x=(3-5)/2=-1
<span>1) 4y^2-7y+1=4(y-(7+</span>√33)/8)(y-(7-√33)/8)<span>
D=49-16=33
y12=(7+-</span>√33)/8<span>
2) x^2-x-1=(x-(1+</span>√5)/2)(x-(1-√5)/2)<span>
D=1+4=5
x12=(1+-</span>√5)/2
(х²-ху) / х² = х (х-у) / х² = (х-у) /х
1)1 11/24+13/36=1 33/72+26/72=1 59/72
2)1 59/72*1 44/100=131/72*144/100=262/100=2,62
3)8/15*5625/10000=8*375/10000=3000/10000=0,3
4)2,62-0,3=2,32