题目内容
计算等式[14| 1 |
| 3 |
| 2 |
| 7 |
| 2 |
| 3 |
| 1 |
| 24 |
分析:可将△当作未知数,通过去括号、移项、系数化为1等过程,求得△的值.注意乘除中将带分数和小数转化为假分数.
解答:解:[14
-(3.78-△÷1
)×1
]÷3.2=4
,
14
-(
-△×
)×
=
×
,
(
-△×
)×
=14
-
×
,
(
-△×
)×
=
,
-△×
=
,
△×
=
,
△=3.78.
故答案为:3.78.
| 1 |
| 3 |
| 2 |
| 7 |
| 2 |
| 3 |
| 1 |
| 24 |
14
| 1 |
| 3 |
| 189 |
| 50 |
| 7 |
| 9 |
| 5 |
| 3 |
| 97 |
| 24 |
| 16 |
| 5 |
(
| 189 |
| 50 |
| 7 |
| 9 |
| 5 |
| 3 |
| 1 |
| 3 |
| 97 |
| 24 |
| 16 |
| 5 |
(
| 189 |
| 50 |
| 7 |
| 9 |
| 5 |
| 3 |
| 7 |
| 5 |
| 189 |
| 50 |
| 7 |
| 9 |
| 21 |
| 25 |
△×
| 7 |
| 9 |
| 147 |
| 50 |
△=3.78.
故答案为:3.78.
点评:本题立意新颖,实际考查解一元一次方程的解法;解一元一次方程常见的过程有去括号、移项、系数化为1等.
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