题目内容
[0.75-(2
-1
)÷4]÷[(1
+2
)÷2
-
].
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[0.75-(2
-1
)÷4]÷[(1
+2
)÷2
-
],
=[
-
÷4]÷[
÷
-
],
=[
-
]÷[
-
],
=
÷
,
=
.
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=[
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=[
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=
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=
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