设y=y(x)y = y(x)y=y(x)是由方程ln(x+y)+5=y\ln(x + y)+ 5 = yln(x+y)+5=y确定的隐函数,则y′=1x+y−1y'=\dfrac{1}{x + y - 1}y′=x+y−11.( )
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