题目内容
求未知数.
=
1-20%x=
:
=x:
.
| 21 |
| x |
| 32 |
| 8 |
1-20%x=
| 1 |
| 8 |
| 1 |
| 20 |
| 1 |
| 5 |
| 1 |
| 4 |
(1)
=
32x=21×8
32x÷32=168÷32
x=5.25;
(2)1-20%x=
,
1-20%x+20%x=
+20%x
1=
+20%x
1-
=
+20%x-
=20%x
÷20%=20%x÷20%
x=
;
(3)
:
=x:
x=
×
x÷
=
÷
x=
.
| 21 |
| x |
| 32 |
| 8 |
32x=21×8
32x÷32=168÷32
x=5.25;
(2)1-20%x=
| 1 |
| 8 |
1-20%x+20%x=
| 1 |
| 8 |
1=
| 1 |
| 8 |
1-
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
| 7 |
| 8 |
| 7 |
| 8 |
x=
| 35 |
| 8 |
(3)
| 1 |
| 20 |
| 1 |
| 5 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 20 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 80 |
| 1 |
| 5 |
x=
| 1 |
| 16 |
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