求未知数x5x-56=51212:35=x:1213x+8×0.5=1656:x=75%:0.4.
(1)5x-
=
5x-
+
=
+
5x=
5x÷5=
÷5
x=
(2)12:
=x:
x=12×
x=6
x×
=6×
x=12
(3)
x+8×0.5=16
x+4=16
x+4-4=16-4
x=12
x×3=12×3
x=36
(4)
:x=75%:0.4
x=
×
x=
x×
=
×
x=
5 |
6 |
5 |
12 |
5x-
5 |
6 |
5 |
6 |
5 |
12 |
5 |
6 |
5x=
15 |
12 |
5x÷5=
15 |
12 |
x=
1 |
4 |
(2)12:
3 |
5 |
1 |
2 |
3 |
5 |
1 |
2 |
3 |
5 |
3 |
5 |
5 |
3 |
5 |
3 |
x=12
(3)
1 |
3 |
1 |
3 |
1 |
3 |
1 |
3 |
1 |
3 |
x=36
(4)
5 |
6 |
3 |
4 |
5 |
6 |
2 |
5 |
3 |
4 |
1 |
3 |
3 |
4 |
4 |
3 |
1 |
3 |
4 |
3 |
x=
4 |
9 |
温馨提示:答案为网友推荐,仅供参考