题目内容
在横线部分填上适当的数.
(1)1÷[(6-2.8)×______]=0.125
(2)1÷(
×______-
)=3.
(1)1÷[(6-2.8)×______]=0.125
(2)1÷(
| 4 |
| 5 |
| 1 |
| 5 |
设横线上的数字是x,
1÷[(6-2.8)×x]=0.125,
1÷3.2x=0.125,
1÷3.2x×3.2x=0.125×3.2x,
1=0.4x,
1÷0.4=0.4x÷0.4,
x=2.5;
(2)1÷(
×x-
)=3,
1÷(
x-
)×(
x-
)=3×(
x-
),
1=
x-
,
1+
=
x-
+
,
=
x,
÷
=
x÷
,
x=
.
故答案为:2.5,
.
1÷[(6-2.8)×x]=0.125,
1÷3.2x=0.125,
1÷3.2x×3.2x=0.125×3.2x,
1=0.4x,
1÷0.4=0.4x÷0.4,
x=2.5;
(2)1÷(
| 4 |
| 5 |
| 1 |
| 5 |
1÷(
| 4 |
| 5 |
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 5 |
1=
| 12 |
| 5 |
| 3 |
| 5 |
1+
| 3 |
| 5 |
| 12 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 8 |
| 5 |
| 12 |
| 5 |
| 8 |
| 5 |
| 12 |
| 5 |
| 12 |
| 5 |
| 12 |
| 5 |
x=
| 2 |
| 3 |
故答案为:2.5,
| 2 |
| 3 |
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