八年级下册数学的计算题一除以括号2x加，x分之一减x的平方括号。
\u516b\u5e74\u7ea7\u6570\u5b66\u4e0b\u7b2c36\u9875\u7b2c3\u9898\u7b2c5\u5c0f\u9898\u600e\u4e48\u505a?\u6c42\u8fc7\u7a0b,\u9898\u76ee\u662f1\u9664\u4ee5\u62ec\u53f72x\u52a0\u4e0ax\u5206\u4e4b1\u51cfx\u5e73\u65b9\u3002\u8981\u8fc7\u7a0b\u30021\u9664\u4ee5\u62ec\u53f72x\u52a0\u4e0ax\u5206\u4e4b1\u51cfx\u5e73\u65b9
=1/(2x)+1/x-x^2
=1/(2x)-1/x(x-1)
=((x-1)-2)/2x(x-1)
=(x-3)/2x(x-1)
\uff08X-1)-(2X+1)
=X-1-2X-1
=-X-2
=1/(2x)+1/x-x^2
=1/(2x)-1/x(x-1)
=((x-1)-2)/2x(x-1)
=(x-3)/2x(x-1)
绛旓細1闄や互鎷鍙2x鍔犱笂x鍒嗕箣1鍑弜骞虫柟 =1/(2x)+1/x-x^2 =1/(2x)-1/x(x-1)=((x-1)-2)/2x(x-1)=(x-3)/2x(x-1)
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