solve X

1._______________-4/(x+4)²=x+1_________________________-4=(x+1)(x+4)²______________(x+1)(x+4)²+4=0__________(x+1)(x²+8x+16)+4=0______x³+x²+8x²+8x+16x+16+4=0______________x³+9x²+24x+20=0_______x³+4x²+4x+5x²+20x+20=0______x(x²+4x+4)+5(x²+4x+4)=0_____________(x²+4x+4)(x+5)=0________________(x+2)²(x+5)=0________________________x+2=0 or x+5=0__________________________x= -5 or -22. _________________2–(a/x)=(x-a)/a __________________________2=(x-a)/a+a/x__________________________2=[x(x-a)+a²]/(ax)________________________2ax=x²-ax+a²________________x²-(3a)x+a²=0x²-2(x)(3a/2)+(3a/2)²-5a²/4=0_________(x-3a/2)²-(√5a/2)²=0_[x+(√5-3)a/2][x-(3=√5)a/2]=0________________x+(√5-3)a/2=0 or x-(3+√5)a/2=0__________________________x= (3-√5)a/2 or (3+√5)a/2

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http://i40.tinypic.com/5u1mao.jpg

2012-01-03 10:32:57 補充：
2)http://i41.tinypic.com/25gcphy.png