(1)y=(5x-7)4(2x+3)3;
(2)y=x
(1)y=(5x-7)4(2x+3)3;
(2)y=x
解：(1)ln|y|=4ln|5x-7|+3ln|2x+3|,·y′=4·
+3·
,
∴y′=y［20(5x-7)-1+6(2x+3)-1］
=2(5x-7)3(2x+3)2(35x+9).
(2)ln|y|=ln|x|+
ln(1-x)-
ln(1+x),
·y′=
+
(-
-
)
=
-
∴y′=y(
-
)
=
·
.