(-3xy-7y)+[4x-3(xy+y-2xy)]怎么解答_数学解答

(-3xy-7y)+[4x-3(xy+y-2xy)]怎么解答

人气：110 ℃　时间：2020-02-29 14:43:46

解答

(-3xy-7y)+[4x-3(xy+y-2xy)]
=(-3xy-7y)+(4x-3xy-3y+6xy)
=-3xy-7y+4x+3xy-3y
=4x-10y