8⁻₆/8⁻₈=8²=64...........................
1) y^4-7y^2-8=0
y^2=r, r^2-7r-8=0
D=49+32=81
r1=8 r2=-1
y1=2~/2 y2=-1
2)m^4+26m^2-27=0
m^2=n, n^2+26n-27=0
D=676+108=784
n1=27 n2=-1
m1=3~/3 m2=-1
~/ знак корня
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А)
<span>{2х-у=8 /х(-3)
</span><span>{2х-3у=-4
</span><span>{-6х+3у=-24
</span><span>{2х-3у=-4
</span>-4х=-28
х=7
14-у=8
-у=8-14
-у=--6
у=6
б)
{3x+2y=9 /х(-1)
{x+2y=3
<span>{-3х-2у=-9
</span><span>{х+2у=3
</span>-2х=-6
х=3
3+2у=3
2у=0
у=0