题目内容
解方程:
| 2.4:
|
| ||||||||||||
| 5.6x-
| 5x-3×
|
(1)
=
,
63x=8×12,
63x÷63=8×12÷63,
x=
;
(2)2.4:
=3.2:x,
2.4x=3.2×
,
2.4x÷2.4=3.2×
÷2.4,
x=2;
(3)
x=
×
,
x÷
=
×
÷
,
x=
;
(4)
×3+2.75x=
,
+2.75x=
,
+2.75x-
=
-
,
2.75x=
,
2.75x÷2.75=
÷2.75,
x=
;
(5)5.6x-
x=4.8,
5x=4.8,
5x÷5=4.8÷5,
x=0.96;
(6)5x-3×
=
,
5x-
=
,
5x-
+
=
+
,
5x=
,
5x÷5=
÷5,
x=
.
| 8 |
| 9x |
| 7 |
| 12 |
63x=8×12,
63x÷63=8×12÷63,
x=
| 32 |
| 21 |
(2)2.4:
| 3 |
| 2 |
2.4x=3.2×
| 3 |
| 2 |
2.4x÷2.4=3.2×
| 3 |
| 2 |
x=2;
(3)
| 28 |
| 3 |
| 49 |
| 9 |
| 9 |
| 7 |
| 28 |
| 3 |
| 28 |
| 3 |
| 49 |
| 9 |
| 9 |
| 7 |
| 28 |
| 3 |
x=
| 3 |
| 4 |
(4)
| 3 |
| 2 |
| 19 |
| 3 |
| 9 |
| 2 |
| 19 |
| 3 |
| 9 |
| 2 |
| 9 |
| 2 |
| 19 |
| 3 |
| 9 |
| 2 |
2.75x=
| 11 |
| 6 |
2.75x÷2.75=
| 11 |
| 6 |
x=
| 2 |
| 3 |
(5)5.6x-
| 3 |
| 5 |
5x=4.8,
5x÷5=4.8÷5,
x=0.96;
(6)5x-3×
| 7 |
| 10 |
| 7 |
| 5 |
5x-
| 21 |
| 10 |
| 7 |
| 5 |
5x-
| 21 |
| 10 |
| 21 |
| 10 |
| 7 |
| 5 |
| 21 |
| 10 |
5x=
| 35 |
| 10 |
5x÷5=
| 35 |
| 10 |
x=
| 7 |
| 10 |
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