Question

(x+y)÷(x-y)怎么算

Answer 1

(x+y)÷(x-y)怎么算一般是求x的代数式的导数。据了解此式含有y，把y看作含有x的代数式求导，[(x+y)÷(x-y)]'=[(1+y')(x-y)-(x+y)(1-y')]/(x-y)^2=(2xy'-2y)/(x-y)^2。