27.定義:若a+b=6,則稱a與b是關(guān)于6的實(shí)驗(yàn)數(shù).
(1)4與
是關(guān)于6的實(shí)驗(yàn)數(shù);代數(shù)式
與5-2x是關(guān)于6的實(shí)驗(yàn)數(shù);
(2)若a=x
2-4x+2,b=x
2-2(x
2-2x-2),判斷a與b是否是關(guān)于6的實(shí)驗(yàn)數(shù),說(shuō)明理由;
(3)若c與d是關(guān)于6的實(shí)驗(yàn)數(shù),且c=-2(3x
2-4x-1),求d的值.