Помогите решить 6 примеров (С решением) *очень надо*
1) X²+3x+2=0
2)x²-7x+12=0
3)3x²+5x-2=0
4)9x²-6x+1=0
5)5x²-14x+8=0
6) 9x²-12x+4=0
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