问题 解答题
解方程.
6.8-0.8x=2
x:
1
4
=
2
5
3
10
答案

(1)6.8-0.8x=2,

6.8-0.8x+0.8x=2+0.8x,

2+0.8x=6.8,

2+0.8x-2=6.8-2,

0.8x=4.8,

0.8x÷0.8=4.8÷0.8,

x=6;

(2)x:

1
4
=
2
5
3
10

3
10
x=
1
4
×
2
5

3
10
x=
1
10

3
10
3
10
=
1
10
÷
3
10

x=

1
10
×
10
3

x=

1
3

不定项选择
问答题