<span>x²-y²-5x-5y=(x-y)(x+y)-5(x+y)=(x+y)(x-y-5)</span>
1)2d/(√3-a)=2d(√3+a)/(√3-a)(√3+a)=(2d√3+2ad)/(3-a^2)
2)3x/(√x+2)=3x(√x-2)/(√x+2)(√x-2)=(3x√x-6x)/(x-4)
3)5t/(√t-√s)=5t(√t+√s)/(√t+√s)(√t-√s)=(5t√t+5t√s)/(t-s)
4)7m/(√m-√(2n)=7m(√m+√(2n))/(√m-√(2n))(√m+√(2n))=(7m√m+7m√(2n))/(m-2n)
А)а=2,b=-3,c=-2
D=(-3)^2-4*2*(-2)=9+16=25
x=3(плюс,минус) 5
______________
4
х1=3+5/4=8/4=2
х2=3-5/4=-2/4=-0,5
Ответ:2;-0,5