题目内容
求未知数X
÷X=
-14.5=5.5
1.1×4-2.2X=0
:
=X:8.
| 1 |
| 3 |
| 3 |
| 8 |
| X |
| 8 |
1.1×4-2.2X=0
| 2 |
| 3 |
| 1 |
| 3 |
(1)
÷x=
,
÷x×x=
x,
x=
,
x×
=
×
,
x=
;
(2)
-14.5=5.5,
-14.5+14.5=5.5+14.5,
×8=20×8,
x=160;
(3)1.1×4-2.2x=0,
4.4-2.2x=0,
4.4-2.2x+2.2x=2.2x,
2.2x÷2.2=4.4÷2.2,
x=2;
(4)
:
=x:8,
x=
×8,
x×3=
×3,
x=16.
| 1 |
| 3 |
| 3 |
| 8 |
| 1 |
| 3 |
| 3 |
| 8 |
| 3 |
| 8 |
| 1 |
| 3 |
| 3 |
| 8 |
| 8 |
| 3 |
| 1 |
| 3 |
| 8 |
| 3 |
x=
| 8 |
| 9 |
(2)
| x |
| 8 |
| x |
| 8 |
| x |
| 8 |
x=160;
(3)1.1×4-2.2x=0,
4.4-2.2x=0,
4.4-2.2x+2.2x=2.2x,
2.2x÷2.2=4.4÷2.2,
x=2;
(4)
| 2 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
| 16 |
| 3 |
x=16.
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