题目内容
解方程:
4X+12=402.5X÷3=6X+
X=
5X-
=
.
4X+12=402.5X÷3=6X+
| 3 |
| 5 |
| 8 |
| 7 |
| 4 |
| 11 |
| 7 |
| 11 |
(1)4X+12=40,
4X+12-12=40-12,
4X=28,
4X÷4=28÷4,
X=7;
(2)2.5X÷3=6,
2.5X÷3×3=6×3,
2.5X=18,
2.5X÷2.5=18÷2.5,
X=7.2;
(3)X+
X=
,
(1+
)X=
,
X=
,
X×
=
×
,
X=
;
(4)5X-
=
,
5X-
+
=
+
,
5X=1,
5X÷5=1÷5,
x=
.
4X+12-12=40-12,
4X=28,
4X÷4=28÷4,
X=7;
(2)2.5X÷3=6,
2.5X÷3×3=6×3,
2.5X=18,
2.5X÷2.5=18÷2.5,
X=7.2;
(3)X+
| 3 |
| 5 |
| 8 |
| 7 |
(1+
| 3 |
| 5 |
| 8 |
| 7 |
| 8 |
| 5 |
| 8 |
| 7 |
| 8 |
| 5 |
| 5 |
| 8 |
| 8 |
| 7 |
| 5 |
| 8 |
X=
| 5 |
| 7 |
(4)5X-
| 4 |
| 11 |
| 7 |
| 11 |
5X-
| 4 |
| 11 |
| 4 |
| 11 |
| 7 |
| 11 |
| 4 |
| 11 |
5X=1,
5X÷5=1÷5,
x=
| 1 |
| 5 |
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