x一1的3次方等于
3\u76841-X\u6b21\u65b9=2\uff0cX\u7b49\u4e8e\u591a\u5c11\uff1f3^(1-x)=2
3/3^x=2
3^x=3/2
x=log(3)[3/2]
log\u4ee53\u4e3a\u5e95\u76843/2
2\u7684x\u6b21\u65b9=1/3
x=log2(1/3)
x=-log2(3)
(X-1)^3
=X^2-3X^2+3X+1。
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