(1)已知x^2+x-1=0 求2x^3+2x^2-2x+2的值(2)若(3x+1)^5=ax^5+bx^4+cx^3+dx^2+ex+f,则a-b+c-d+e-f的值是A -32 B 32 C 1024 D -1024(3)已知x^2-xy-2y^2-x-7y-6=(x-2y+A)(x+y+B) 求A,B的值(4)若A=(2+1)(2^2+1)(2^4+1)(2^8+1)

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