题目内容
求未知数X:
X-
X=
9X-1.8=5.4
40%x=4.2.
X-
| 1 |
| 4 |
| 3 |
| 8 |
9X-1.8=5.4
40%x=4.2.
①x-
x=
x×
=
×
x=
;
②9x-1.8=5.4
9x-1.8+1.8=5.4+1.8
9x=7.2
9x÷9=7.2÷9
x=0.8;
③40%x=4.2
0.4x÷0.4=4.2÷0.4
x=10.5.
| 1 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
| 4 |
| 3 |
| 3 |
| 8 |
| 4 |
| 3 |
x=
| 1 |
| 2 |
②9x-1.8=5.4
9x-1.8+1.8=5.4+1.8
9x=7.2
9x÷9=7.2÷9
x=0.8;
③40%x=4.2
0.4x÷0.4=4.2÷0.4
x=10.5.
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