题目内容
解方程
| x-
| ||||||
| 4.5x-2.2=6.8 | x+
|
(1)
x+
x=20
x=20
x×
=20×
x=16;
(2)x-
x=12
x=12
x×
=12×
x=15;
(3)4.5x-2.2=6.8
4.5x-2.2+2.2=6.8+2.2
4.5x=9
4.5x÷4.5=9÷4.5
x=2;
(4)x+
x=
×
x=
x×
=
×
x=
.
| 1 |
| 2 |
| 3 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 4 |
| 5 |
| 4 |
| 5 |
x=16;
(2)x-
| 1 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 5 |
| 4 |
| 5 |
| 4 |
x=15;
(3)4.5x-2.2=6.8
4.5x-2.2+2.2=6.8+2.2
4.5x=9
4.5x÷4.5=9÷4.5
x=2;
(4)x+
| 5 |
| 7 |
| 8 |
| 9 |
| 3 |
| 2 |
| 12 |
| 7 |
| 4 |
| 3 |
| 12 |
| 7 |
| 7 |
| 12 |
| 4 |
| 3 |
| 7 |
| 12 |
x=
| 7 |
| 9 |
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