200x+170(70-x)+160(40-x)+150[30-(40-x)]解的步骤

显示全部楼层 · 2013-5-23 22:11:18

200x+170(70-x)+160(40-x)+150[30-(40-x)]=200x+11900-170x+6400-160x+150(30-40+x)=200x+11900-170x+6400-160x+150(-10+x)=200x+11900-170x+6400-160x-1500+150x=(200x-170x-160x+150x)+(11900+6400-1500)=20X+16800...

千问 · 2013-5-23 22:11:18

200x+170(70-x)+160(40-x)+150[30-(40-x)]=200x+11900-170x+6400-160x+4500-6000+150x=20x+16800...

千问 · 2013-5-23 22:11:18

200x+170(70-x)+160(40-x)+150[30-(40-x)]=200x+170*70-170x+160*40-160x+150*30-150*40+150x=20x+16800...

千问 · 2013-5-23 22:11:18

解方程么？但这里没有等式。...