题目内容
解方程.
5X-3×
=
5-
X=
2X+40%X=7.2
5×(X-
)=2.
5X-3×
| 10 |
| 7 |
| 7 |
| 5 |
5-
| 2 |
| 3 |
| 1 |
| 3 |
2X+40%X=7.2
5×(X-
| 1 |
| 3 |
(1)5X-3×
=
,
5X-
=
,
5X-
+
=
+
,
5X÷5=
÷5,
X=1
;
(2)5-
X=
,
5-
X+
X=
+
X,
5-
=
+
X-
,
4
×
=
X×
,
X=7;
(3)2X+40%X=7.2,
2.4X=7.2,
2.4X÷2.4=7.2÷2.4,
X=3;
(4)5×(X-
)=2,
5×(X-
)÷5=2÷5,
X-
+
=
+
,
X=
.
| 10 |
| 7 |
| 7 |
| 5 |
5X-
| 30 |
| 7 |
| 7 |
| 5 |
5X-
| 30 |
| 7 |
| 30 |
| 7 |
| 7 |
| 5 |
| 30 |
| 7 |
5X÷5=
| 199 |
| 35 |
X=1
| 24 |
| 175 |
(2)5-
| 2 |
| 3 |
| 1 |
| 3 |
5-
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
5-
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
4
| 2 |
| 3 |
| 3 |
| 2 |
| 2 |
| 3 |
| 3 |
| 2 |
X=7;
(3)2X+40%X=7.2,
2.4X=7.2,
2.4X÷2.4=7.2÷2.4,
X=3;
(4)5×(X-
| 1 |
| 3 |
5×(X-
| 1 |
| 3 |
X-
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 5 |
| 1 |
| 3 |
X=
| 11 |
| 15 |
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