（1）已知m+n=3,mn=2/3,求m^3n-m^2n^2+mn^3(2已知a+b=7,ab=3,求a^3b+ab^3

来源：学生作业帮助网编辑：六六作业网时间：2024/11/24 14:36:16

（1）已知m+n=3,mn=2/3,求m^3n-m^2n^2+mn^3(2已知a+b=7,ab=3,求a^3b+ab^3（1）已知m+n=3,mn=2/3,求m^3n-m^2n^2+mn^3(2已知a

（1）已知m+n=3,mn=2/3,求m^3n-m^2n^2+mn^3(2已知a+b=7,ab=3,求a^3b+ab^3
（1）已知m+n=3,mn=2/3,求m^3n-m^2n^2+mn^3
(2已知a+b=7,ab=3,求a^3b+ab^3

（1）已知m+n=3,mn=2/3,求m^3n-m^2n^2+mn^3(2已知a+b=7,ab=3,求a^3b+ab^3
(1)把mn提取出来得：mn(m^2-mn+n^2) .然后(m+n)^2=m^2+n^2+2mn=9.m^2-mn+n^2=7.所以最后为14/3
(2)同样提取ab得ab(aa+bb).最后答案为129

已知m-n=4,mn=-1,求（-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn）的值. 已知mn/m+n=2,求3m-5mn+3n/（-m）+3mn-n 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m-n=3,mn=-1,求多项式-2mn+2m+3n-3mn-2n+2m-4n-m-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=-1,求（-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值已知1/m-1/n=2,试求(3m+mn-3n)/(m-mn-n)的值已知|m+n-2|+(mn+3)的平方=0,求2（m+n）-2[mn+（m+n）]+3[2(m+n)-3mn]的值已知：|m+n-2|+(mn+3)的平方=0.求：2（ m+n）-2[mn+(m+n)]-3[2(m+n)-3m+n] 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的值已知m+n=-5,mn=4,求2（mn-3m）-3（2n-mn）若m-n=4,mn=-1,求（-2mn+2m+3n）-（3mn+2n-2m）-（m+4n+mn）已知m-n=4,m、n互为倒数求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4m+mn)的值已知m+n+=3,mn=三分之二,求m²+(n-m)²+2m(n-mn)的值已知m+n=3,mn=2/3,求mn-mn+mn的值