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miniona
@miniona
September 2021
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mikael2
Verified answer
80+9x≥0 x≥-80/9 min x∈Z = -8
-------------------------------
= 2.706/1.23 * 10⁻⁵/10³=2.2*10⁻⁸
---------------------------------------
6-5x-x²=5x+6 x²+10x=x(x+10) x1=0 y1=5x+6= 6
x2= -10 y2=-50+6= -44
------------------------------------------------------------------------------------
√x +1=2/x x>0
√x=z z≥0 z+1=2/z² z³+z²-2=0 видим z=1 корень и делим
z³+z²-2 на z-1 уголком
z³+z²+0*z-2 | z-1
z²+2z+2 корней нет, D<0
z³-z²
------------------
2z²+0*z
2z²-2z
-----------------------
2z-2
2z-2
-----------------------
0
1 корень z=1 →√x=1 x=1 y=2/1=2 xy=2
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Answers & Comments
Verified answer
80+9x≥0 x≥-80/9 min x∈Z = -8-------------------------------
= 2.706/1.23 * 10⁻⁵/10³=2.2*10⁻⁸
---------------------------------------
6-5x-x²=5x+6 x²+10x=x(x+10) x1=0 y1=5x+6= 6
x2= -10 y2=-50+6= -44
------------------------------------------------------------------------------------
√x +1=2/x x>0
√x=z z≥0 z+1=2/z² z³+z²-2=0 видим z=1 корень и делим
z³+z²-2 на z-1 уголком
z³+z²+0*z-2 | z-1
z²+2z+2 корней нет, D<0
z³-z²
------------------
2z²+0*z
2z²-2z
-----------------------
2z-2
2z-2
-----------------------
0
1 корень z=1 →√x=1 x=1 y=2/1=2 xy=2