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4+x>0 x>-4 и 1+2x>0 x>-1/2, т е х>-1/2
4+8x+x+2x²=9
2x²+9x-5=0
x1,2=((-9+-√(81+40))/4= (-9+-11)/4, x1=-5-не удовлетворяет x>-1/2
x2=1/2-ответ
2) 1+x>0 x>-1и 2+x>0 x>-2, т е х>-1
= (по основанию 2)log(1+x)(2+x)=1
x²+x+2x+2=2, x²+3x=0 x1=0, x2=-3-не удовлетворяет x>-1
x=0- ответ
3) x-2>0 x>2 и x+1>0 x>-1, т е x>2
= (по основанию 2)log(x-2)(x+1)=2, x²+x-2x-2=4, x²-x-6=0, x1,2=(1+-√(1+24))/2=(1+-5)/2, x=3- ответ