题目内容
求未知数X的值.
X÷
=
0.8X+
=2.75
X:28%=
:0.7.
| 12 |
| 25 |
| 1 |
| 5 |
| 1 |
| 5 |
0.8X+
| 7 |
| 4 |
X:28%=
| 7 |
| 4 |
(1)
X÷
=
,
X÷
×
=
×
,
x=
,
x÷
=
÷
,
x=
;
(2)0.8X+
=2.75,
0.8X+
-
=2.75-
,
0.8x=1,
0.8x÷0.8=1÷0.8,
x=1.25;
(3)X:28%=
:0.7,
0.7x=28%×
,
0.7x=0.49,
0.7x÷0.7=0.49÷0.7,
x=0.7.
| 12 |
| 25 |
| 1 |
| 5 |
| 1 |
| 5 |
| 12 |
| 25 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 12 |
| 25 |
| 1 |
| 25 |
| 12 |
| 25 |
| 12 |
| 25 |
| 1 |
| 25 |
| 12 |
| 25 |
x=
| 1 |
| 12 |
(2)0.8X+
| 7 |
| 4 |
0.8X+
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
| 4 |
0.8x=1,
0.8x÷0.8=1÷0.8,
x=1.25;
(3)X:28%=
| 7 |
| 4 |
0.7x=28%×
| 7 |
| 4 |
0.7x=0.49,
0.7x÷0.7=0.49÷0.7,
x=0.7.
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