题目内容
求未知数X的值.
X-
=1.758X-5.5X=10.36:8=X:25.
| 3 |
| 4 |
| 3 |
| 8 |
(1)
X-
=1.75
X-
+
=1.75+
,
X=
,
X÷
=
÷
,
x=2
;
(2)8X-5.5X=1
2.5x=1,
2.5x÷2.5=1÷2.5,
x=0.4;
(3)0.36:8=X:25
8x=25×0.36,
8x=9,
8x÷8=9÷8,
x=1.125.
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
| 4 |
| 17 |
| 8 |
| 3 |
| 4 |
| 3 |
| 4 |
| 17 |
| 8 |
| 3 |
| 4 |
x=2
| 5 |
| 6 |
(2)8X-5.5X=1
2.5x=1,
2.5x÷2.5=1÷2.5,
x=0.4;
(3)0.36:8=X:25
8x=25×0.36,
8x=9,
8x÷8=9÷8,
x=1.125.
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