W=200x+(40-x)160+(70-x)170+[30-(40-x)]150怎么化简_数学解答

W=200x+(40-x)160+(70-x)170+[30-(40-x)]150怎么化简

人气：286 ℃　时间：2020-04-12 04:21:31

解答

W=200x+(40-x)160+(70-x)170+[30-(40-x)]150
=200x+(40-x)160+(70-x)170+4500-(40-x)150
=200x+(40-x)160-(40-x)150+(70-x)170+4500
=200x+(40-x)10+(70-x)170+4500
=200x+400-10x+11900-170x+4500
=20x+16800