2y/y-5 - 5/y-5=0
2y-5/y-5=0
OДЗ: y неравно 5
2y-5=0
2y=5
y=2,5
=d²+2d-9d-18-d²+15d-6d+90=2d+72.
при d= -0,12, 2d+72= -0,12·2+72= -0,24+72=71,76.
9x+ay+9y+ax=(9x+9y)+(ay+ax)=9(x+y)+a(y+x)=(x+y)(9+a)
7a-7b+an-bn=(7a-7b)+(an-bn)=7(a-b)+n(a-b)=(a-b)(7+n)
ax+ay-x-y=(ax+ay)-(x+y)=a(x+y)-(x+y)=(x+y)(a-1)
1-bx-x+b=(1-x)-(bx-b)=(1-x)-b(x-1)=(1-x)+b(1-x)=(1-x)(1+b)
xy+2y-2x-4=(2y-4)+(xy-2x)=2(y-2)+x(y-2)=(y-2)(2+x)