(3x-4xy-6y)-2(x-4xy+2y)

问题描述:

(3x-4xy-6y)-2(x-4xy+2y)

去括号!
(3x-4xy-6y)-2(x-4xy+2y)
=3x-4xy-6y-2x+8xy-4y
=x+4xy-10y