<span>x-y+x^2-y^2=<span>-(y-x)*(y+x+1)=<span>(x-y)*(y+x+1)</span></span></span>
9x^2 - 12x - 4 = 0
a=9, b=-12, c=-4
<span>k = b/2 = -12/2 = -6
D1 = k^2 - ac = (-6)^2 - 9*(-4) = 36 + 36 = 72 > 0
x1 = -k + </span>√72/a = 6+√72/a = 6+2√18/9;<span>
x2 = -k - </span>√72/a = 6-√72/a = 6 - 2√18/9;
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Ответ : </span>6+2√18/9; 6 - 2√18/9;
49x^4y^6×(-7y^11)= -343x^4y^17
-1/2y^12×(-16y^2)=8y^14
-8x^9y^6 (-8y^6)=64x^9y^12