1,3m²-7m-4=0..设a=3,b=-7,c=-4,所以b²-4ac=97..所以m1=(7+根97)/6,m2=(7-根97)/6..
2,x²+2(根2-1)x+3-2根2=0,x²+2(根2-1)x+3-2根2=(x+根2-1)²=0,所以x1=x2=1-根2..
3,(2x-5)²-(x-4)²=0,所以(2x-5+x-4)(2x-5-x+4)=0,即(3x-9)(x-1)=0..所以x1=3,x2=1..
1,3m²-7m-4=0..设a=3,b=-7,c=-4,所以b²-4ac=97..所以m1=(7+根97)/6,m2=(7-根97)/6..
2,x²+2(根2-1)x+3-2根2=0,x²+2(根2-1)x+3-2根2=(x+根2-1)²=0,所以x1=x2=1-根2..
3,(2x-5)²-(x-4)²=0,所以(2x-5+x-4)(2x-5-x+4)=0,即(3x-9)(x-1)=0..所以x1=3,x2=1..