题目内容
解方程.
(1)4+0.7x=102
(2)
×
-x=
(3)
=
(4)6x+
=0.8×1.5.
(1)4+0.7x=102
(2)
| 3 |
| 5 |
| 1 |
| 2 |
| 1 |
| 5 |
(3)
| x |
| 24 |
| 5 |
| 8 |
(4)6x+
| 1 |
| 5 |
(1)4+0.7x=102,
4+0.7x-4=102-4,
0.7x=98,
0.7x÷0.7=98÷0.7,
x=140;
(2)
×
-x=
,
-x=
,
-x+x=
+x,
+x=
,
+x-
=
-
,
x=
;
(3)
=
,
8x=24×5,
8x=120,
8x÷8=120÷8,
x=15;
(4)6x+
=0.8×1.5,
6x+0.2=1.2,
6x+0.2-0.2=1.2-0.2,
6x=1,
6x÷6=1÷6,
x=
.
4+0.7x-4=102-4,
0.7x=98,
0.7x÷0.7=98÷0.7,
x=140;
(2)
| 3 |
| 5 |
| 1 |
| 2 |
| 1 |
| 5 |
| 3 |
| 10 |
| 1 |
| 5 |
| 3 |
| 10 |
| 1 |
| 5 |
| 1 |
| 5 |
| 3 |
| 10 |
| 1 |
| 5 |
| 1 |
| 5 |
| 3 |
| 10 |
| 1 |
| 5 |
x=
| 1 |
| 10 |
(3)
| x |
| 24 |
| 5 |
| 8 |
8x=24×5,
8x=120,
8x÷8=120÷8,
x=15;
(4)6x+
| 1 |
| 5 |
6x+0.2=1.2,
6x+0.2-0.2=1.2-0.2,
6x=1,
6x÷6=1÷6,
x=
| 1 |
| 6 |
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