题目内容
求下列各式中的x:
18:x=2.7:15
15:x=1.2:1.5
=
x:3
=3
:2.2.
18:x=2.7:15
15:x=1.2:1.5
| x |
| 2 |
| 2-3x |
| 3 |
x:3
| 1 |
| 7 |
| 1 |
| 2 |
(1)18:x=2.7:15,
2.7x=18×15,
2.7x÷2.7=270÷2.7,
x=100;
(2)15:x=1.2:1.5,
1.2x=15×1.5,
1.2x=22.5,
1.2x÷1.2=22.5÷1.2,
x=18.75;
(3)
=
,
3x=4-6x,
3x+6x=4-6x+6x,
9x÷9=4÷9,
x=
;
(4)x:3
=3
:2.2,
2.2x=3
×3
,
2.2x÷2.2=11÷2.2,
x=5.
2.7x=18×15,
2.7x÷2.7=270÷2.7,
x=100;
(2)15:x=1.2:1.5,
1.2x=15×1.5,
1.2x=22.5,
1.2x÷1.2=22.5÷1.2,
x=18.75;
(3)
| x |
| 2 |
| 2-3x |
| 3 |
3x=4-6x,
3x+6x=4-6x+6x,
9x÷9=4÷9,
x=
| 4 |
| 9 |
(4)x:3
| 1 |
| 7 |
| 1 |
| 2 |
2.2x=3
| 1 |
| 7 |
| 1 |
| 2 |
2.2x÷2.2=11÷2.2,
x=5.
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