靠因式分解头都分大了头发都分叉了.“1^2”表示1的2次方这个大家应该都知道吧.急要 会写几题写几题吧.公式法:1)2^(n+1)x^2+2^(n+1)x+2^(n-1)十字相乘法:1)x^2+4x+32)x^2-5x+63)x^2-2x-34)x^2+2x-35)2x^2+7x+5

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