题目内容
求未知数x.
19-120%x=7
x+
x=42
=
:
=x:
.
19-120%x=7
| 2 |
| 3 |
| 1 |
| 2 |
| 36 |
| x |
| 1.8 |
| 5 |
| 1 |
| 2 |
| 1 |
| 5 |
| 1 |
| 10 |
(1)19-120%x=7,
19-120%x+120%x=7+120%x,
19-7=7+120%x-7,
12÷120%=120%x÷120%,
x=10;
(2)
x+
x=42,
x÷
=42÷
,
x=36;
(3)
=
,
1.8x=36×5,
1.8x÷1.8=180÷1.8,
x=100;
(4)
:
=x:
,
x=
×
,
x÷
=
÷
,
x=
.
19-120%x+120%x=7+120%x,
19-7=7+120%x-7,
12÷120%=120%x÷120%,
x=10;
(2)
| 2 |
| 3 |
| 1 |
| 2 |
| 7 |
| 6 |
| 7 |
| 6 |
| 7 |
| 6 |
x=36;
(3)
| 36 |
| x |
| 1.8 |
| 5 |
1.8x=36×5,
1.8x÷1.8=180÷1.8,
x=100;
(4)
| 1 |
| 2 |
| 1 |
| 5 |
| 1 |
| 10 |
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
| 10 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 20 |
| 1 |
| 5 |
x=
| 1 |
| 4 |
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