题目内容
求未知数X:
①X-0.2X-7=25;
②4:X=5:
.
①X-0.2X-7=25;
②4:X=5:
| 5 |
| 8 |
解方程:①X-0.2X-7=25,
0.8x-7+7=25+7,
0.8x÷0.8=32÷0.8,
x=40;
②4:X=5:
,
5x=4×
,
5x÷5=
÷5,
x=
.
0.8x-7+7=25+7,
0.8x÷0.8=32÷0.8,
x=40;
②4:X=5:
| 5 |
| 8 |
5x=4×
| 5 |
| 8 |
5x÷5=
| 5 |
| 2 |
x=
| 1 |
| 2 |
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