(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](/uploads/image/z/4330696-40-6.jpg?t=%28%E6%95%91%E5%91%BD%E5%95%8A%29a%2Bb%3D3%2Ca%2Ab%3D1%2C%E6%B1%82%28a-b%29%5E2-3%28a-b%29%5E4%2B70)
(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