解不等式:3(x+2)^2-3(x+1)(x-1)≤12x^2-(6x-3)(2x+1)(需过程)

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解不等式:3(x+2)^2-3(x+1)(x-1)≤12x^2-(6x-3)(2x+1)(需过程)

解不等式:3(x+2)^2-3(x+1)(x-1)≤12x^2-(6x-3)(2x+1)(需过程)
解不等式:3(x+2)^2-3(x+1)(x-1)≤12x^2-(6x-3)(2x+1)(需过程)

解不等式:3(x+2)^2-3(x+1)(x-1)≤12x^2-(6x-3)(2x+1)(需过程)
3(x^2+2x+4)-3(x^2-1)≤12x^2-(12x^2-6x+6x-3)
3x^2+6x+12-3x^2+3≤12x^2-12x^2+3
6x+15≤3
x≤-2

化3(x^2+4x+4)-3(x^2-1)-12x^2+12x^2+6x-6x-3≤0
3x^2+12x+12-3x^2+3-3≤0
12x+12≤0
x≤-1