题目内容
| 解比例: 9:5﹦4.5:x; |
|
| ||||||||||||
| x:
|
|
(1)9:5﹦4.5:x,
9x=5×4.5,
9x÷9=22.5÷9,
x=2.5;
(2)
:x﹦
:
,
x=
×
,
x×8=
×8,
x=
;
(3)
﹦
,
0.4x=28×0.1,
0.4x÷0.4=2.8÷0.4,
x=7;
(4)
:
﹦x:8,
x=
×8,
x×45=
×45,
x=6.
(5)x:
﹦51:17,
17x=
×51,
17x÷17=
÷17,
x=1
;
(6)
﹦
:
,
x=
×6,
x×
=2×
,
x=2.4.
9x=5×4.5,
9x÷9=22.5÷9,
x=2.5;
(2)
| 1 |
| 10 |
| 1 |
| 8 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 10 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 40 |
x=
| 1 |
| 5 |
(3)
| 28 |
| x |
| 0.4 |
| 0.1 |
0.4x=28×0.1,
0.4x÷0.4=2.8÷0.4,
x=7;
(4)
| 1 |
| 60 |
| 1 |
| 45 |
| 1 |
| 45 |
| 1 |
| 60 |
| 1 |
| 45 |
| 2 |
| 15 |
x=6.
(5)x:
| 3 |
| 5 |
17x=
| 3 |
| 5 |
17x÷17=
| 153 |
| 5 |
x=1
| 4 |
| 5 |
(6)
| 6 |
| x |
| 5 |
| 6 |
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 3 |
| 5 |
| 6 |
| 6 |
| 5 |
| 6 |
| 5 |
x=2.4.
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