题目内容
求未知数x.
(1)12÷(0.5x-1)=6
(2)12:x=
:
(3)x-20%x=2.4.
(1)12÷(0.5x-1)=6
(2)12:x=
| 1 |
| 8 |
| 1 |
| 4 |
(3)x-20%x=2.4.
(1)12÷(0.5x-1)=6,
12÷(0.5x-1)×(0.5x-1)=6(0.5x-1),
6(0.5x-1)=12,
6(0.5x-1)÷6=12÷6,
0.5x-1=2,
0.5x-1+1=2+1,
0.5x=3,
0.5x÷0.5=3÷0.5,
x=6;
(2)12:x=
:
,
x=12×
,
x=3,
x÷
=3÷
,
x=24;
(3)x-20%x=2.4,
0.8x=2.4,
0.8x÷0.8=2.4÷0.8,
x=3.
12÷(0.5x-1)×(0.5x-1)=6(0.5x-1),
6(0.5x-1)=12,
6(0.5x-1)÷6=12÷6,
0.5x-1=2,
0.5x-1+1=2+1,
0.5x=3,
0.5x÷0.5=3÷0.5,
x=6;
(2)12:x=
| 1 |
| 8 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
x=24;
(3)x-20%x=2.4,
0.8x=2.4,
0.8x÷0.8=2.4÷0.8,
x=3.
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