题目内容
解方程或比例.
4x÷5-2.8=2.8
:
=x:50.
4x÷5-2.8=2.8
| 3 |
| 10 |
| 1 |
| 5 |
(1)4x÷5-2.8=2.8,
0.8x-2.8=2.8,
0.8x-2.8+2.8=2.8+2.8,
0.8x=5.6,
0.8x÷0.8=5.6÷0.8,
x=7;
(2)
:
=x:50,
x=
×50,
x=15,
x×5=15×5,
x=75.
0.8x-2.8=2.8,
0.8x-2.8+2.8=2.8+2.8,
0.8x=5.6,
0.8x÷0.8=5.6÷0.8,
x=7;
(2)
| 3 |
| 10 |
| 1 |
| 5 |
| 1 |
| 5 |
| 3 |
| 10 |
| 1 |
| 5 |
| 1 |
| 5 |
x=75.
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