(3x-4xy-6y)-2(x-4xy+2y)
问题描述:
(3x-4xy-6y)-2(x-4xy+2y)
答
去括号!
(3x-4xy-6y)-2(x-4xy+2y)
=3x-4xy-6y-2x+8xy-4y
=x+4xy-10y