^ - степень
1) 7x^2-7y^2=7(x^2-y^2)=7(x-y)(x+y)
2) 4m^3-4mn^2=4m(m^2-n^2)=4m(m-n)(m+n)
3) x(a-b)+a-b=(a-b)(x+1)
5) m^2(a-2)+n(2-a)=m^2(a-2)-n(a-2)=(a-2)(m^2-n)
6) 2n(x-y)-(y-x)=2n(x-y)+(x-y)=(x-y)(2n+1)
1) 5m^2+10m+5=5(m^2+2m+1)
2) 2xy^2+4xy+2x=2x(y^2+2y+2)
3) 3a-6ab+3ab^2=3a(1-2b+b^2)=3a(b^2-2b+1)
<span>(9x-1)(x+3)-(3x-1)(3x+2)=22
9x^2+27x-x-3-(9x^2+6x-3x-2)=22
9x^2+27x-x-3-9x^2-6x+3x+2-22=0
23x-23=0
23x=23
x=23/23
x=1
</span>
2х-1/15-2+х/5+3х-2/30=1-х
2х-1/15-2+х/5+3х-2/30-1+х=0
4х-2-12-6х+3х-2-30+30х=0
31х-46=0
31х=46
х=46/31
₂₇
А_________В_____С
³⁵
ВС=АС-АВ=35-27=8