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

来源:学生作业学帮网 编辑:学帮网 时间:2024/05/16 10:00:48

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

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

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

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

解方程么? 但这里没有等式。