m+n=-3,mn=2,求-3(1/3n-mn)+2(mn-1/2m)

问题描述:

m+n=-3,mn=2,求-3(1/3n-mn)+2(mn-1/2m)

-3(1/3n-mn)+2(mn-1/2m)=-3*1/3n-3*(-mn)+2*mn-2*1/2m=-n+6+4-m=-n-m+10=-(n+m)+10=-(-3)+10=3+10=13