3x+4-4=5.5-4,
3x=1.5,
3x÷3=1.5÷3,
x=0.5;
②4x÷
3 |
5 |
4 |
15 |
4x÷
3 |
5 |
3 |
5 |
4 |
15 |
3 |
5 |
4x=
4 |
25 |
4x÷4=
4 |
25 |
x=
1 |
25 |
③
3 |
4 |
1 |
5 |
11 |
12 |
x(
3 |
4 |
1 |
5 |
11 |
12 |
11 |
20 |
11 |
12 |
11 |
20 |
11 |
20 |
11 |
12 |
11 |
20 |
x=
5 |
3 |
④4×1.25-6x=3.2,
5-6x=3.2,
5-6x+6x=3.2+6x,
3.2+6x=5,
3.2+6x-3.2=5-3.2,
6x=1.8,
6x÷6=1.8÷6,
x=0.3.