№2.5(m+n)^2-m(10n+m)-n^2=5(m^2+2mn+n^2)-10mn-m^2-n^2=5m^2+10mn+5n^2-10mn-m^2-n^2=4m^2+4n^2.
F¹(x)=3x²-6
g¹(x)=1/(6√x)
f¹(x)*g¹(x)=0
(3x²-6)1/(6√x)=0
x≠0
3x²-6=0
3x²=6
x²=2
x₁=√2 x₂=-√2
<span>(x+2)²+6=(x-3)²-2x
x</span>²+4x+4+6=x²-6x+9-2x
4x+8x=9-10
12x=-1
x=-1/12
<span>6х - 3(4х + 1) > 6
6х - 12х - 3 > 6
-6x > 9
x < -9/6
x < -1.5
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