log(2)(x+4)=3^x
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log(2)(x+4)=3^x
log(2)(x+4)=3^x
log(2)(x+4)=3^x
2分法可以解 不过是近似的
可以判断 (0,1)内至少有一个跟 而在对整理过的方程 求导后可知函数单调 所以仅一个根 在(0,1)内
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