题目内容
解方程或比例.
①
=
②
:x=5:0.4
③2.5x-1.9×3=6.2.
①
| x |
| 6 |
| 2.5 |
| 3 |
②
| 1 |
| 4 |
③2.5x-1.9×3=6.2.
(1)
=
,
3x=6×2.5,
3x÷3=15÷3,
x=5;
(2)
:x=5:0.4
5x=
×0.4,
5x=0.1,
5x÷5=0.1÷5,
x=0.02;
(3)2.5x-1.9×3=6.2,
2.5x-5.7=6.2,
2.5x-5.7+5.7=6.2+5.7,
2.5x÷2.5=11.9÷2.5,
x=4.76.
| x |
| 6 |
| 2.5 |
| 3 |
3x=6×2.5,
3x÷3=15÷3,
x=5;
(2)
| 1 |
| 4 |
5x=
| 1 |
| 4 |
5x=0.1,
5x÷5=0.1÷5,
x=0.02;
(3)2.5x-1.9×3=6.2,
2.5x-5.7=6.2,
2.5x-5.7+5.7=6.2+5.7,
2.5x÷2.5=11.9÷2.5,
x=4.76.
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