Ответ:
1)
2)
3)
4)
1) 2x(a+b)+y(a+b)=(a+b)(2x+y)
2) 3a(x-y)-b(x-y)=(x-y)(3a-b)
3) 4c²(m+n)+d(m+n)=(m+n)(4c²+d)
1) ab+a=a(a+b)
2) a³b-a=a(a²b-1)
3) x³y²-y²=y²(x³-1)
4) 2ab-4a=2a(b-2)
5) 27y⁴-18y²=9y²(3y²-2)
2*sqrt(3)*cos(2p/3)-2*cos(p/6)=
cos(2p/3)=-cos(p/3 )=-1/2 cos(p/6)=sqrt(3)/2
= -sqrt(3)-sqrt(3)=-2sqrt(3)
2
а)
б)
в)
г)
3
а)
б)(1/a²-1/b²)*a²b²=(b²-a²)/a²b² * *a²b²=b²-a²
в)
4
5
(x+y)/(∛x+∛y)=(∛x+∛y)(∛x²-∛(xy)+∛y²)/(∛x+∛y)=∛x²-∛(xy)+∛y²
{x= 7-y
{xy=12
{x=7-y
{7y-y^2-12=0
x=7-y
y1=3 y2=4
x1=4 x2=3
1.)-6x+1=5x+9
-11x=8
x=-8/11
y=-6x+1=5, 9/11
2.)21-9x=-2.5x=8
13=6,5x
x=2
y=21-9x=21-9*2=3
3.)16,2+8x=-8x+7,4
16x=-23,6
x=1 19/40
y=28
5.)1-3x=-x-1
-2x=-2
x=1
y=-x-1=-1-1=-2
6.)1+7x=6,5x
-0,5x=1
x=-2
y=-13