计算﹙1/4a^3+n×b^m-1﹚²×﹙4a^3-n×b^m+1﹚²,1.已知x≠0且x+1/x=5,求x²+1/x²和x^4+1/x^4的值2.﹙1/4a^3+n×b^m-1﹚²×﹙4a^3-n×b^m+1﹚²3.已知x²+x-1=0,求：x³+2x²+3的值。x³+2x²
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