题目内容
求未知数x的值:
(1)1.3x+0.9x-3=0.3
(2)
x÷
=
(3)
=
(4)0.6:3.6=
:x.
(1)1.3x+0.9x-3=0.3
(2)
| 1 |
| 13 |
| 4 |
| 5 |
| 10 |
| 13 |
(3)
| 0.75 |
| 1.5 |
| x |
| 8 |
(4)0.6:3.6=
| 4 |
| 5 |
(1)1.3x+0.9x-3=0.3,
2.2x-3=0.3,
2.2x-3+3=0.3+3,
2.2x=3.3
2.2x÷2.2=3.3÷2.2,
x=1.5;
(2)
x÷
=
,
x÷
×
=
×
,
x=
,
x÷
=
÷
,
x=8;
(3)
=
,
×8=
×8,
x=
×8,
x=4;
(4)0.6:3.6=
:x,
0.6x=3.6×
,
0.6x=2.88,
0.6x÷0.6=2.88÷0.6,
x=4.8.
2.2x-3=0.3,
2.2x-3+3=0.3+3,
2.2x=3.3
2.2x÷2.2=3.3÷2.2,
x=1.5;
(2)
| 1 |
| 13 |
| 4 |
| 5 |
| 10 |
| 13 |
| 1 |
| 13 |
| 4 |
| 5 |
| 4 |
| 5 |
| 10 |
| 13 |
| 4 |
| 5 |
| 1 |
| 13 |
| 8 |
| 13 |
| 1 |
| 13 |
| 1 |
| 13 |
| 8 |
| 13 |
| 1 |
| 13 |
x=8;
(3)
| 0.75 |
| 1.5 |
| x |
| 8 |
| 0.75 |
| 1.5 |
| x |
| 8 |
x=
| 0.75 |
| 1.5 |
x=4;
(4)0.6:3.6=
| 4 |
| 5 |
0.6x=3.6×
| 4 |
| 5 |
0.6x=2.88,
0.6x÷0.6=2.88÷0.6,
x=4.8.
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