题目内容
| 5:x=3:9 |
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x:
| 36:18=x:5.4 | ||||||||||||
| 1:
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| X:1.5=25% |
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| x:
|
(1)5:x=3:9,
3x=5×9,
3x÷3=45÷3,
x=15;
(2)
=
,
4x=54×5,
4x÷4=270÷4,
x=67.5;
(3)x:
=4:
,
x=
×4,
x÷
=1÷
,
x=
;
(4)36:18=x:5.4,
18x=36×5.4,
18x÷18=194.4÷18,
x=10.8;
(5)
=
,
1.5x=6×10,
1.5x÷1.5=60÷1.5,
x=40;
(6)1:
=x:
,
x=1×
,
x÷
=
÷
,
x=
;
(7)
:
=x:
,
x=
×
,
x÷
=
÷
,
x=
;
(8)
:
=
:x,
x=
×
,
x÷
=
÷
,
x=
;
(9)
=
,
2x=12×7,
2x÷2=84÷2,
x=42;
(10)
:x=
:
,
x=
×
,
x÷
=
÷
,
x=
;
(11)
:
=x:
,
x=
×
,
x÷
=
÷
,
x=
;
(12)
=1.5:4,
4x=1.5×0.8,
4x÷4=1.2÷4,
x=0.3;
(13)X:1.5=25%,
X=1.5×25%,
X=0.375;
(14)
=0.6,
x=13×0.6,
x=7.8;
(15)
=
,
2x=2.5×25,
2x÷2=62.5÷2,
x=31.25;
(16)x:
=
,
x=
×
,
x=
.
3x=5×9,
3x÷3=45÷3,
x=15;
(2)
| 54 |
| x |
| 4 |
| 5 |
4x=54×5,
4x÷4=270÷4,
x=67.5;
(3)x:
| 1 |
| 4 |
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
x=
| 3 |
| 2 |
(4)36:18=x:5.4,
18x=36×5.4,
18x÷18=194.4÷18,
x=10.8;
(5)
| 6 |
| 1.5 |
| x |
| 10 |
1.5x=6×10,
1.5x÷1.5=60÷1.5,
x=40;
(6)1:
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
x=
| 2 |
| 3 |
(7)
| 3 |
| 8 |
| 2 |
| 5 |
| 6 |
| 5 |
| 2 |
| 5 |
| 3 |
| 8 |
| 6 |
| 5 |
| 2 |
| 5 |
| 2 |
| 5 |
| 9 |
| 20 |
| 2 |
| 5 |
x=
| 9 |
| 8 |
(8)
| 5 |
| 6 |
| 2 |
| 3 |
| 1 |
| 8 |
| 5 |
| 6 |
| 2 |
| 3 |
| 1 |
| 8 |
| 5 |
| 6 |
| 5 |
| 6 |
| 1 |
| 12 |
| 5 |
| 6 |
x=
| 1 |
| 10 |
(9)
| 2 |
| 12 |
| 7 |
| x |
2x=12×7,
2x÷2=84÷2,
x=42;
(10)
| 7 |
| 2 |
| 3 |
| 5 |
| 1 |
| 7 |
| 3 |
| 5 |
| 7 |
| 2 |
| 1 |
| 7 |
| 3 |
| 5 |
| 3 |
| 5 |
| 1 |
| 2 |
| 3 |
| 5 |
x=
| 5 |
| 6 |
(11)
| 1 |
| 10 |
| 1 |
| 8 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 10 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 40 |
| 1 |
| 8 |
x=
| 1 |
| 5 |
(12)
| x |
| 0.8 |
4x=1.5×0.8,
4x÷4=1.2÷4,
x=0.3;
(13)X:1.5=25%,
X=1.5×25%,
X=0.375;
(14)
| x |
| 13 |
x=13×0.6,
x=7.8;
(15)
| 2.5 |
| x |
| 2 |
| 25 |
2x=2.5×25,
2x÷2=62.5÷2,
x=31.25;
(16)x:
| 3 |
| 4 |
| 8 |
| 9 |
x=
| 3 |
| 4 |
| 8 |
| 9 |
x=
| 2 |
| 3 |
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