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