题目内容
解方程
x-
x=
2x+
=
70%x+20%x=3.6.
x-
| 2 |
| 7 |
| 3 |
| 4 |
2x+
| 2 |
| 5 |
| 3 |
| 5 |
70%x+20%x=3.6.
(1)x-
x=
,
x=
,
x×
=
×
,
x=1
;
(2)2x+
=
,
2x+
-
=
-
,
2x÷2=
÷2,
x=
;
(3)70%x+20%x=3.6,
0.9x=3.6
0.9x÷0.9=3.6÷0.9,
x=4.
| 2 |
| 7 |
| 3 |
| 4 |
| 5 |
| 7 |
| 3 |
| 4 |
| 5 |
| 7 |
| 7 |
| 5 |
| 3 |
| 4 |
| 7 |
| 5 |
x=1
| 1 |
| 20 |
(2)2x+
| 2 |
| 5 |
| 3 |
| 5 |
2x+
| 2 |
| 5 |
| 2 |
| 5 |
| 3 |
| 5 |
| 2 |
| 5 |
2x÷2=
| 1 |
| 5 |
x=
| 1 |
| 10 |
(3)70%x+20%x=3.6,
0.9x=3.6
0.9x÷0.9=3.6÷0.9,
x=4.
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