题目内容
求未知数x.
11+3x﹦20x-
x﹦0.47:
﹦x:0.2.
11+3x﹦20x-
| 2 |
| 3 |
| 1 |
| 4 |
(1)11+3x=20,
11+3x-11=20-11,
3x=9,
3x÷=9÷3,
x=3;
(2)x-
x=0.4,
x=0.4,
x÷
=0.4÷
,
x=1.2;
(3)7:
=x:0.2.
x=7×0.2,
x=1.4,
x÷
=1.4÷
,
x=5.6.
11+3x-11=20-11,
3x=9,
3x÷=9÷3,
x=3;
(2)x-
| 2 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
x=1.2;
(3)7:
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
x=5.6.
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