1)<span>cosa=u*(m+M)/mv=0.2*(80+720)/80*4=0,2*800/320=0,5
a=60гр
2)y`=8x-10+2/x=(8x²-10x+2)/x=0
2(4x²-5x+1)=0
D=25-16=9
x1=(5-3)/8=1/4∉[0;3;3]
x2=(5+3)/8=1∈[0,3;3]
y(0,3)=4*0,09-10*0,3+2ln0,3 -5≈0,36-3+2*(-1,2)-5≈-10,04
y(1)=4*1-10*1+2ln1-5=4-10+0-5=-11-наим
y(3)=4*9-10*3+2ln3-5≈36-30+2*1,1-5≈3,2</span>
Ответ:
Объяснение:
1)(x+y)(x-y)=x^2-y^2
2)(n-m)(n+m)=n^2-m^2
3)(k-2)(k+2)=k^2-4
4)(3-c)(3+c)=9-c^2
5)(4-b)(4+b)=16-b^2
6)(a-7)(a+7)=a^2-49
7)(1/7+x)(1/7-x)=1/49-x^2
8)(a-2/9)(a+2/9)=a^2-4/81
9)(5/6+m)(5/6-m)=25/36 - m^2
10)0,4+n)(0,4-m)=0,016-0,4m+0,4n-nm
11)(k+1,1)(k-1,1)=k^2-1,21
12)(d-2,2)(d+2,2)=d^2-4,84²²²²
<span>1) -√3 + i
|</span>-√3 + i| = √(3+1)=2
cos(5π/6) = -√3/2
sin(5π/6) = 1/2
-√3 + i = 2cos(5π/6) + 2i*sin(5π/6)
2) <span>-√3 - i
|</span>-√3 - i| = √(3+1)=2
cos(7π/6) = -√3/2
sin(7π/6) = -1/2
<span>-√3 - i = 2cos(7</span>π/6) + 2i*sin(7π/6)
Ответ:
Объяснение:
Система уравнений:
x³-y³=-35; (x-y)(x²+xy+y²)=-35; 7(x-y)=-35; x-y=-35/7; x-y=-5
x²+xy+y²=7
x=y-5
(y-5)²+y(y-5)+y²=7
y²-10y+25+y²-5y+y²-7=0
3y²-15y+18=0
y²-5y+6=0
D=25-24=1
y1=(5-1)/2=4/2=2
y2=(5+1)/2=6/2=3
x1=2-5=-3
x2=3-5=-2
Ответ: (-3; 2); (-2; 3)