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-3×
+3×
=
+3×
,
5x=
,
5x÷5=
÷5,
x=1
;
(2)5-
x=
,
5-
x+
x=
+
x,
+
x=5,
+
x-
=5-
,
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-
+
=
+
,
x=
.
| 10 |
| 7 |
| 7 |
| 5 |
5x-3×
| 10 |
| 7 |
| 10 |
| 7 |
| 7 |
| 5 |
| 10 |
| 7 |
5x=
| 199 |
| 35 |
5x÷5=
| 199 |
| 35 |
x=1
| 24 |
| 175 |
(2)5-
| 2 |
| 3 |
| 1 |
| 3 |
5-
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
| 3 |
| 2 |
| 14 |
| 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 |
| 2 |
| 5 |
x-
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 5 |
| 1 |
| 3 |
x=
| 11 |
| 15 |
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