А) x^2/5y и z-3/y^2 <=> (y*x^2) / 5y^2 и (5z-15) / 5y^2
-14,9(x^2+8,4x-9x-75.,6)=0
-14,9x^2+8,94x+1 126,44=0/-14,9
X^2-0,6x-75,6=0
D=0,36-4*1*(-75,6)=302,76=17,4^2
X1=0,6+17,4/2*1=9
X2=0,6-17,4/2*1=-8,4
Arccos(√3/2)=П/6
arctg(1/√3)=П/3
П/6+2П/3=5П/6
2х+у^2 = 6
x+y = 3
y=3-x
2x+(3-x)^2-6=0
y=3-x
x²-4x+3=0⇒x=1; x=3
Два случая:
y=2
x=1
y=0
x=3
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1) 9a^2+16+24a
4-4b+b^2
b^2-9
25y^2-4x^2
2) c^2-b^2-5c^2+b^2=-4c^2
3. (5y-a)(5y+a)
(c+2b)^2
4. 12-16+8x-x^2=3x-x^2
8x-4=3x
5x=4
x=0,8
5. (9x^2-y^4)
a^6+36a^2-12a^4=a^2(a^4+36-12a^2)
(a^2-x^2)^2=a^4+x^4-2x^2a^2