-1/4m^2+1/3mn-1/9n^2

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 18:52:10
-1/4m^2+1/3mn-1/9n^2-1/4m^2+1/3mn-1/9n^2-1/4m^2+1/3mn-1/9n^2-(1/2m-1/3n)m²+1/3mn+(1/9n²-3/

-1/4m^2+1/3mn-1/9n^2
-1/4m^2+1/3mn-1/9n^2

-1/4m^2+1/3mn-1/9n^2
-(1/2m-1/3n)

m²+1/3mn+(1/9n²-3/4m²)=(1/2m+1/3n)²

x²+6ax+9a
=(x+3a)²

(x-2a)²-a(2a-x)
=(x-2a)(x-2a+a)
=(x-2a)(x-a)

(2x+6)²=4x²+24x+36
所以m=24
望采纳