初三数学题.急.在线等.x+2 x+8 x+4 x+6—— + —— = —— + ——x+1 x+7 x+3 x+5x+2 x+8 x+4 x+6—— + —— = —— + ——x+1 x+7 x+3 x+5 阿。 要解出来。 = = 。
2019-04-15
初三数学题.急.在线等.
x+2 x+8 x+4 x+6
—— + —— = —— + ——
x+1 x+7 x+3 x+5
x+2 x+8 x+4 x+6
—— + —— = —— + ——
x+1 x+7 x+3 x+5
阿。 要解出来。 = = 。
优质解答
化简:
[1+1/(x+1)]+[1+1/(x+7)]=[1+1/(x+3)]+[1+1/(x+5)]
即
1/(x+1)+1/(x+7)=1/(x+3)+1/(x+5)
移项:
1/(x+1)-1/(x+3)=1/(x+5)-1/(x+7)
即:2/(x+1)(x+3)=2/(x+5)(x+7)
即:(x+1)(x+3)=(x+5)(x+7)
即:x^2+4x+3=x^2+12x+35
即:4x+3=12x+35
8x=-32
x=-4
化简:
[1+1/(x+1)]+[1+1/(x+7)]=[1+1/(x+3)]+[1+1/(x+5)]
即
1/(x+1)+1/(x+7)=1/(x+3)+1/(x+5)
移项:
1/(x+1)-1/(x+3)=1/(x+5)-1/(x+7)
即:2/(x+1)(x+3)=2/(x+5)(x+7)
即:(x+1)(x+3)=(x+5)(x+7)
即:x^2+4x+3=x^2+12x+35
即:4x+3=12x+35
8x=-32
x=-4