已知m^2-mn=20,mn-n^2=-12,求代数式m^2-n^2与m^2-2mn+n^2的值

来源：学生作业帮助网编辑：六六作业网时间：2024/11/15 06:06:10

已知m^2-mn=20,mn-n^2=-12,求代数式m^2-n^2与m^2-2mn+n^2的值已知m^2-mn=20,mn-n^2=-12,求代数式m^2-n^2与m^2-2mn+n^2的值已知m^

已知m^2-mn=20,mn-n^2=-12,求代数式m^2-n^2与m^2-2mn+n^2的值
已知m^2-mn=20,mn-n^2=-12,求代数式m^2-n^2与m^2-2mn+n^2的值

已知m^2-mn=20,mn-n^2=-12,求代数式m^2-n^2与m^2-2mn+n^2的值
m^2-mn=20,mn-n^2=-12
两式相加得m²-n²=8
两式相减得m²-2mn+n²=32

已知m+n=3,mn=2/3,求mn-mn+mn的值已知mn-n=20,m-mn=16,则m-n=?,-2mn+m+n=? 已知m+n=-4 mn=2求mn 已知m^2-mn=20,mn-n^=-8,求m^2-2mn+n^2的值已知MN^2=-6,求-MN(M^2N^5-MN^3-N)的值已知m-n=2,mn=1,求多项式(-2mn+2mn+3n)-(3mn+2n-2m)-(m+4n+mn)的值已知m-n=2,mn=1,求多项式(-2mn+2mn+3n)-(3mn+2n-2m)-(m+4n+mn)的值已知mn-n=15,m-mn=6,则m-n=_,-2mn+m+n=_ 已知mn-m=15,n-mn=6则n-m=( ),-2mn+m+n=( ) 已知m-mn=21,mn-n=15,求m-n与m-2mn+n的值. 已知mn/m+n=2求3m-5mn+3n/-m+3mn-n 已知M+N分之MN=2,求-m+3mn-n分之3m-5mn+3n 已知mn/m+n=2,求3m-5mn+3n/（-m）+3mn-n 已知mn／m+n=2,求3m-5mn+3n/-m+3mn-n的值已知m-n=4,mn=2,求多项式（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)的值已知m-n=2,mn=1,求多项式(2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值已知m-n=4,mn=2,求多项式（-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值. 已知m-n=4,mn=-1,求（-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn）的值.