先根据已知条件求的b的表达式,然后带进求解的式子,水解一个一元三次方程,然后根据a>1,求解范围,进而得到最小值!!!祝你好运!!
若实数a,b满足ab-4a-b+1=0(a>1),则(a+1)(b+2)的最小值为______.
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