求未知数X.(1)1.5:0.3=x:2.7; (2)5x-1.2=2....
求未知数X.(1)1.5:0.3=x:2.7;(2)5x-1.2=2.8;(3)x+13x=415....
求未知数X.(1)1.5:0.3=x:2.7; (2)5x-1.2=2.8; (3)x+13x=415.
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(1)1.5:0.3=x:2.7
0.3x=1.5×2.7
0.3x÷0.3=1.5×2.7÷0.3
x=1.35
(2)5x-1.2=2.8
5x-1.2+1.2=2.8+1.2
5x=4
5x÷5=4÷5
x=0.8
(3)x+
x=
x=
x÷
=
÷
x=0.2
0.3x=1.5×2.7
0.3x÷0.3=1.5×2.7÷0.3
x=1.35
(2)5x-1.2=2.8
5x-1.2+1.2=2.8+1.2
5x=4
5x÷5=4÷5
x=0.8
(3)x+
| 1 |
| 3 |
| 4 |
| 15 |
| 4 |
| 3 |
| 4 |
| 15 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
| 15 |
| 4 |
| 3 |
x=0.2
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