题目内容
解方程或比例.
2x-45=55
0.5:
=
:x.
2x-45=55
0.5:
| 2 |
| 5 |
| 2 |
| 5 |
(1)2x-45=55,
2x-45+45=55+45,
2x÷2=100÷2,
x=50;
(2)0.5:
=
:x,
0.5x=
×
,
0.5x÷0.5=
÷0.5,
x=
.
2x-45+45=55+45,
2x÷2=100÷2,
x=50;
(2)0.5:
| 2 |
| 5 |
| 2 |
| 5 |
0.5x=
| 2 |
| 5 |
| 2 |
| 5 |
0.5x÷0.5=
| 4 |
| 25 |
x=
| 8 |
| 25 |
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