(x+9)(x-9)=0怎么算？ x/(0.1-x)=9怎么算
-X\uff08X-9\uff09>0\u600e\u4e48\u7b97\u4f60\u597d\uff0c\u9700\u8981\u7b49\u5f0f\u5de6\u8fb9\u5927\u4e8e0\uff0c\u89e3\u2235-X(X-9)\uff1e0 \u2234 \u9700\u8981 -X*\uff08X-9\uff09\u4e3a\u6b63\uff0c\u2234 -X\u548c\uff08X-9\uff09\u90fd\u4e3a\u6b63\u6216\u90fd\u4e3a\u8d1f\uff0c\u53c8\u2235\u5f53X\u22659\u6216X\u22640 \u4e0d\u7b49\u5f0f\u4e0d\u6210\u7acb\u22340\uff1cX\uff1c9 \u671b\u91c7\u7eb3
\u79fb\u9879 x=9(0.1-x)
\u53bb\u62ec\u53f7 x=0.9-9x
\u5408\u5e76\u540c\u7c7b\u9879 10x=0.9
\u89e3 x=0.09
X^2=81
X=正负9
或者是拆开算：X+9=0
X-9=0
X=正负9
x+9=0或者x-9=0,所以答案是9或者-9
＝X²-9²
＝X²-81
X＝±9
x＝9或x＝-9
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