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