已知m^2-n=45,4m^2+6n+2/3=0,求2m^4+m^2n-3n^2的值.

来源:学生作业帮助网 编辑:六六作业网 时间:2024/05/08 10:24:42
已知m^2-n=45,4m^2+6n+2/3=0,求2m^4+m^2n-3n^2的值.已知m^2-n=45,4m^2+6n+2/3=0,求2m^4+m^2n-3n^2的值.已知m^2-n=45,4m^

已知m^2-n=45,4m^2+6n+2/3=0,求2m^4+m^2n-3n^2的值.
已知m^2-n=45,4m^2+6n+2/3=0,求2m^4+m^2n-3n^2的值.

已知m^2-n=45,4m^2+6n+2/3=0,求2m^4+m^2n-3n^2的值.
2m^4+m^2n-3n^2=(2m^2+3n)(m^2-n)
已知:m^2-n=45,4m^2+6n+2/3=0
所以:m^2-n=45,2m^2+3n=-1/3
2m^4+m^2n-3n^2=(2m^2+3n)(m^2-n)=-1/3*45=-15

2m^4+m^2n-3n^2=(m^2-n)(2m^2+3n)
=45*(-1/3)=-15