题目内容
解方程.
x÷
=12
x÷
=
÷
19+120%x=31
x-
x=
.
| 2 |
| 3 |
| 1 |
| 4 |
| 8 |
| 21 |
| 8 |
| 21 |
| 4 |
| 15 |
| 8 |
| 21 |
19+120%x=31
x-
| 2 |
| 7 |
| 1 |
| 14 |
(1)
x÷
=12
x÷
×
=12×
x=3
x÷
=3÷
X=
(2)
x÷
=
÷
X=
(3)19+120%x=31
19+120%x-19=31-19
120%x=12
120%x÷120%=12÷120%
X=10
(4)x-
x=
(1-
)X=
X=
X÷
=
÷
X=
| 2 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
X=
| 9 |
| 2 |
(2)
| 8 |
| 21 |
| 8 |
| 21 |
| 4 |
| 15 |
| 8 |
| 21 |
X=
| 7 |
| 10 |
(3)19+120%x=31
19+120%x-19=31-19
120%x=12
120%x÷120%=12÷120%
X=10
(4)x-
| 2 |
| 7 |
| 1 |
| 14 |
(1-
| 2 |
| 7 |
| 1 |
| 14 |
| 5 |
| 7 |
| 1 |
| 14 |
| 5 |
| 7 |
| 5 |
| 7 |
| 1 |
| 14 |
| 5 |
| 7 |
X=
| 1 |
| 10 |
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