解方程：2x+(50-x)4=126 要步骤啊！

显示全部楼层 · 2012-7-9 18:01:27

2x+(50-x)4=126 解:2X+4 x 50-4X=126(如果有括号的要先去括号,先乘除,后加减)
200-126=2X(把等号左边的数调到等号右边时和右边的数调到左边来,要变号,正数变负数,负数变正数)
74=2X
X=37...

千问 · 2012-7-9 18:01:27

2x+(50-x)4=126 2x+200-4x=1264x-2x=200-1262x=74x=37...

千问 · 2012-7-9 18:01:27

2x+(50-x)4=1262x+200-4x=126200-2x=126200-126=2xx=74/2x=37...

千问 · 2012-7-9 18:01:27

2x+200-4x=126 -2x=-74
x=37...

千问 · 2012-7-9 18:01:27

2x+200-4x=1264x-2x=200-1262x=74x=37...