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(3х+2)^2+(4х+1)(4х-1)=(5х-1)^2=9х^2+12х+4+16х^2-4х+4х-1=25х^2-10х+1
9х^2+12х+16х^2-4х+4х-25х^2+10х=-4+1+1
22х=-2
х=-2:22
х=-1\11
=(a²-1)(a²+1) /( (a³+a²)+(a+1))= (a-1)(a+1)(a²+1) / (a+1)(a²+1) =a-1.
1) (a^2-5a+6)/(a^2+7a+12)*(a^2+3a)/(a^2-4a+4)=((a-3)(a-2))/((a+3)(a+4))*(a(a+3))/((a-2)(a-2))=(a(a-3))/((a-2)(a+4))
2) (x^2+2x-3)/(x^2+3x-10)*(x^2-9x+14)/(x^2+7x+12)=((x-1)(x+3))/((x-2)(x+5))*((x-7)(x-2))/((x+3)(x+4))=(x-1)(x-7)/(x+5)(x+4)
Вроде так, но могу ошибаться)