已知单项式-3a^2-mb与ab^n+1是同类项,求代数式m^2-(-3mn+3n^2)+2n^2的值.求...

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/27 13:03:11
已知单项式-3a^2-mb与ab^n+1是同类项,求代数式m^2-(-3mn+3n^2)+2n^2的值.求...
x){}KN}p=ƉqFIOv%&i>鄞wumlz{*s4ts4Y-O$xP; lhG[ U*5@{fulu a*sՔ -vC !,:[*m] C]cY6yvυ

已知单项式-3a^2-mb与ab^n+1是同类项,求代数式m^2-(-3mn+3n^2)+2n^2的值.求...
已知单项式-3a^2-mb与ab^n+1是同类项,求代数式m^2-(-3mn+3n^2)+2n^2的值.
求...

已知单项式-3a^2-mb与ab^n+1是同类项,求代数式m^2-(-3mn+3n^2)+2n^2的值.求...
∵-3a^2-mb与ab^n+1是同类项
∴2-m=1
n+1=0
即:m=1,n=-1
∴m²-(-3mn+3n²)+2n²
=m²+3mn-n²
=1-3-1
=-3