题目内容
求未知数Χ.
①32-0.4X=22
②
:X=2:
.
①32-0.4X=22
②
| 3 |
| 5 |
| 1 |
| 3 |
(1)32-0.4X=22,
32-0.4x+0.4x=22+0.4x,
32-22=22+0.4x-22,
10=0.4x,
10÷0.4=0.4x÷0.4,
x=25;
(2)
:X=2:
,
2x=
×
,
2x=0.2,
2x÷2=0.2x÷0.2,
x=0.1.
32-0.4x+0.4x=22+0.4x,
32-22=22+0.4x-22,
10=0.4x,
10÷0.4=0.4x÷0.4,
x=25;
(2)
| 3 |
| 5 |
| 1 |
| 3 |
2x=
| 3 |
| 5 |
| 1 |
| 3 |
2x=0.2,
2x÷2=0.2x÷0.2,
x=0.1.
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