题目内容
解方程.
2χ+40%χ=7.2
Χ-
Χ=
Χ÷
=12.
2χ+40%χ=7.2
Χ-
| 5 |
| 9 |
| 8 |
| 15 |
| 2 |
| 3 |
| 1 |
| 4 |
(1)2χ+40%χ=7.2
2x+0.4x=7.2,
2.4x=7.2
(2.4÷2.4)x=7.2÷2.4,
x=3;
(2)x-
x=
,
(1-
)x=
,
x=
,
x÷
=
÷
,
x=
×
,
x=
;
(3)
x÷
=12,
x×4=12,
x=12,
x÷
=12÷
,
x=12×
,
x=
.
2x+0.4x=7.2,
2.4x=7.2
(2.4÷2.4)x=7.2÷2.4,
x=3;
(2)x-
| 5 |
| 9 |
| 8 |
| 15 |
(1-
| 5 |
| 9 |
| 8 |
| 15 |
| 4 |
| 9 |
| 8 |
| 15 |
| 4 |
| 9 |
| 4 |
| 9 |
| 8 |
| 15 |
| 4 |
| 9 |
x=
| 8 |
| 15 |
| 9 |
| 4 |
x=
| 6 |
| 5 |
(3)
| 2 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
x=12×
| 3 |
| 8 |
x=
| 9 |
| 2 |
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