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

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/07/05 14:47:23
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