题目内容
解方程
x+0.5x=30
-
x=
=
.
x+0.5x=30
| 9 |
| 4 |
| 1 |
| 4 |
| 3 |
| 8 |
| 1.8 |
| x |
| 7.2 |
| 0.8 |
(1)x+0.5x=30,
1.5x=30,
1.5x÷1.5=30÷1.5,
x=20;
(2 )
-
x=
,
-
x+
x=
+
x,
+
x=
,
+
x-
=
-
,
x=
,
x÷
=
÷
,
x=7
;
( 3 )
=
,
7.2x=1.8×0.8,
7.2x=1.44,
7.2x÷7.2=1.44÷7.2,
x=0.2.
1.5x=30,
1.5x÷1.5=30÷1.5,
x=20;
(2 )
| 9 |
| 4 |
| 1 |
| 4 |
| 3 |
| 8 |
| 9 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
| 9 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
| 3 |
| 8 |
| 9 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
| 15 |
| 8 |
| 1 |
| 4 |
| 1 |
| 4 |
| 15 |
| 8 |
| 1 |
| 4 |
x=7
| 1 |
| 2 |
( 3 )
| 1.8 |
| x |
| 7.2 |
| 0.8 |
7.2x=1.8×0.8,
7.2x=1.44,
7.2x÷7.2=1.44÷7.2,
x=0.2.
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