题目内容
解下列方程.
x=
x÷
=8
x+20×
=19
x+
x=42.
| 7 |
| 8 |
| 21 |
| 40 |
| 1 |
| 3 |
| 4 |
| 5 |
x+20×
| 1 |
| 4 |
x+
| 7 |
| 8 |
(1)
x=
x÷
=
÷
x=
(2)
x÷
=8
x÷
×
=8×
x=
x÷
=
÷
x=
(3)x+20×
=19
x+5=19
x+5-5=19-5
x=14
(4)x+
X=42
(1+
)X=42
X=42
X÷
=42÷
X=
| 7 |
| 8 |
| 21 |
| 40 |
| 7 |
| 8 |
| 7 |
| 8 |
| 21 |
| 40 |
| 7 |
| 8 |
x=
| 3 |
| 5 |
(2)
| 1 |
| 3 |
| 4 |
| 5 |
| 1 |
| 3 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 1 |
| 3 |
| 32 |
| 5 |
| 1 |
| 3 |
| 1 |
| 3 |
| 32 |
| 5 |
| 1 |
| 3 |
x=
| 96 |
| 5 |
(3)x+20×
| 1 |
| 4 |
x+5=19
x+5-5=19-5
x=14
(4)x+
| 7 |
| 8 |
(1+
| 7 |
| 8 |
| 15 |
| 8 |
| 15 |
| 8 |
| 15 |
| 8 |
| 15 |
| 8 |
X=
| 112 |
| 5 |
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