(x+1)(x+3)(x+5)(x+7)-9
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(x+1)(x+3)(x+5)(x+7)-9
如果好的话,
如果好的话,
(X+1)(X+3)(X+5)(X+7)-9
=(x+1)(x+7)(x+3)(x+5)-9
=(x^2+8x+7)(x^2+8x+15)-9
令x^2+8x+7=t
(X+1)(X+3)(X+5)(X+7)-9
=(x^2+8x+7)(x^2+8x+15)-9
=t(t+8)-9=t^2+8t-9=(t+9)(t-1)
=(x^2+8x+7+9)(x^2+8x+7-1)
=(x^2+8x+16)(x^2+8x+6)
=(x+4)^2*(x^2+8x+16)
不懂发消息问我
=(x+1)(x+7)(x+3)(x+5)-9
=(x^2+8x+7)(x^2+8x+15)-9
令x^2+8x+7=t
(X+1)(X+3)(X+5)(X+7)-9
=(x^2+8x+7)(x^2+8x+15)-9
=t(t+8)-9=t^2+8t-9=(t+9)(t-1)
=(x^2+8x+7+9)(x^2+8x+7-1)
=(x^2+8x+16)(x^2+8x+6)
=(x+4)^2*(x^2+8x+16)
不懂发消息问我
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