Maths 题

2006-10-18 3:29 am
2.5 x +2=3 x-2
=?????

回答 (3)

2006-10-18 4:00 am
✔ 最佳答案
2.5 x +2=3 x-2
2.5x+2+2=3x
2.5x+4=3x
4=3x-2.5x
4= 0.5x
4/0.5=x
x=8
參考: 自己
2006-10-18 3:43 am
2.5 x +2=3 x-2
2.5x+2-2=3x-2-2
2.5x=3x-4
2.5x+4=3x-4+4
2.5x+4=3x
4+2.5x-2.5x=3x-2.5x
4=0.5x
4÷0.5=0.5x÷0.5
8=x
x=8
2006-10-18 3:36 am
2.5 x +2=3 x-2
2.5 x +2-2.5x=3x-2+2+2.5x
5.5x=0
x=0


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