3X292x求解3x(x-2)=9-2x,3x2-6x=9-2x,3x2-4x-9=0。a=3,b=-4,c=-9,?=b2-4ac=(-4)2-4*3*(-9)=16+108=124。x=(-b±√?)/(2a)=(4±√124)/6=(2±√31)/3。x?=(2+√31)/3,x?=(2-√31)/3。【如果】3*(x-2)=9-2x,那么3x-6=9-2x,3x+2x=9+6,5x=15,x=3。2,已知x232丨y1丨0试求12x2x13y213y213y2(x-2/3)2+丨y+1丨=0,