3m²-7m-4=o(用配方法解） x²+2(根号2-1)x+3-2根号2=0 (2x-5)²-(x+4)²=0x²+2(根号2-1)x+3-2根号2=0和(2x-5)²-(x+4)²=0是两个方程

3m²-7m-4=o(用配方法解） x²+2(根号2-1)x+3-2根号2=0 (2x-5)²-(x+4)²=0x²+2(根号2-1)x+3-2根号2=0和(2x-5)²-(x+4)²=0是两个方程
3m²-7m-4=o(用配方法解） x²+2(根号2-1)x+3-2根号2=0 (2x-5)²-(x+4)²=0
x²+2(根号2-1)x+3-2根号2=0和(2x-5)²-(x+4)²=0是两个方程

3m²-7m-4=o(用配方法解） x²+2(根号2-1)x+3-2根号2=0 (2x-5)²-(x+4)²=0x²+2(根号2-1)x+3-2根号2=0和(2x-5)²-(x+4)²=0是两个方程
3m²-7m-4=o
3(m^2-7/3m+(7/6)^2-(7/6)^2)-4=o
3(m-7/6)^2-3*(49/36)-4=o
3(m-7/6)^2=(49/12)+4
(m-7/6)^2=97/36
m=7/6+√97/6或m=7/6-√97/6
x²+2(根号2-1)x+3-2根号2=0
x²+2(√2-1)x+（√2-1)^2=0
(x+√2-1)^2=0
x=-√2+1
(2x-5)²-(x+4)²=0
(2x-5+x+4)(2x-5-(x+4))=0
(3x+1)(x-9)=0
x=-1/3 或 x=9