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