3 |
20 |
17 |
20 |
17 |
20 |
17 |
20 |
17 |
20 |
x=22;
(2)
1 |
4 |
1 |
8 |
1 |
10 |
1 |
8 |
1 |
4 |
1 |
10 |
1 |
8 |
1 |
40 |
1 |
8 |
1 |
8 |
1 |
40 |
1 |
8 |
x=
1 |
5 |
(3)1.5x-x=1
0.5x=1
0.5x÷0.5=1÷0.5
x=2;
(4)15x÷2=60
15x÷2×2=60×2
15x=120
15x÷15=120÷15
x=8.
求未知數(shù)x: x-
|
| ||||||||
1.5x-x=1 | 15x÷2=60 |
3 |
20 |
17 |
20 |
17 |
20 |
17 |
20 |
17 |
20 |
1 |
4 |
1 |
8 |
1 |
10 |
1 |
8 |
1 |
4 |
1 |
10 |
1 |
8 |
1 |
40 |
1 |
8 |
1 |
8 |
1 |
40 |
1 |
8 |
1 |
5 |