(救命啊)a+b=3,a*b=1,求(a-b)^2-3(a-b)^4+70

(救命啊)a+b=3,a*b=1,求(a-b)^2-3(a-b)^4+70
(救命啊)a+b=3,a*b=1,求(a-b)^2-3(a-b)^4+70

(救命啊)a+b=3,a*b=1,求(a-b)^2-3(a-b)^4+70
a+b=3;
a*b=1;
(a-b)^2=(a+b)^2-4a*b=5
带入表达式得：
(a-b)^2-3(a-b)^4+70
=5-3*25+70
=0

0
提示：(a-b)^2=5