а) (х-3)(х-6)=x²-6x-3x+18=x²-9x+18=0
б) (x+9)(x-3)=x²-3x+9x-27=x²+6x-27=0
в)(x-0,4)(x-6.1/6)=x²-(6.1/6)x-0,4x+37/15=x²-173/30x+37/15
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а) (х-3)(х-6)=x²-6x-3x+18=x²-9x+18=0
б) (x+9)(x-3)=x²-3x+9x-27=x²+6x-27=0
в)(x-0,4)(x-6.1/6)=x²-(6.1/6)x-0,4x+37/15=x²-173/30x+37/15