题目内容
解方程
| 130+5x=270 | x-0.3x=21 | x÷
|
| 4x=
|
(1)130+5x=270,
130+5x-130=270-130,
5x=140,
5x÷5=140÷5,
x=28;
(2)x-0.3x=21,
0.7x=21,
0.7x÷0.7=21÷0.7,
x=30;
(3)x÷
=15,
x÷
×
=15×
,
x=9;
(4)
x=
,
x×
=
×
,
x=
;
(5)4x=
,
4x÷4=
÷4,
x=
.
130+5x-130=270-130,
5x=140,
5x÷5=140÷5,
x=28;
(2)x-0.3x=21,
0.7x=21,
0.7x÷0.7=21÷0.7,
x=30;
(3)x÷
| 3 |
| 5 |
x÷
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
x=9;
(4)
| 7 |
| 8 |
| 5 |
| 12 |
| 7 |
| 8 |
| 8 |
| 7 |
| 5 |
| 12 |
| 8 |
| 7 |
x=
| 10 |
| 21 |
(5)4x=
| 3 |
| 4 |
4x÷4=
| 3 |
| 4 |
x=
| 3 |
| 16 |
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