3.5x-31.4=2x怎么算

问题描述:

3.5x-31.4=2x怎么算

3.5x-31.4=2x
3.5x=2x+31,4
3.5x-2X=31,4
1,5X=31,4
X=

3.5x-31.4=2x
3.5x=2x+31.4
1.5x=31.4
x=31.4/1.5
x=20.93333......

知识点:解一元一次方程,小数的知识(3.5=35/10 31.4=314/10)
3.5x-31.4=2x
35x-314=20x(等式两边同乘以10)
35x-20x=314(移项)
15x=314
x=314/15

3.5x-31.4=2x
3.5x-2x=31.4
1.5x=31.4
x=31.4/1.5
x=314/15

3.5x-31.4=2x
3.5x-2x=31.4
1.5x=31.4
x=20.93

3.5x-31.4=2x
31.4=3.5x-2x
1.5x=31.4
x=20.9333.......