题目内容

下面等式不成立的是(  )
A.
9
10
-
3
7
+
1
10
=
9
10
+
1
10
-
3
7
B.
7
8
÷
2
5
×
8
7
=
7
8
×
8
7
÷
2
5
C.
1
4
+
3
4
÷
2
3
+
1
3
=(
1
4
+
3
4
)÷(
2
3
+
1
3
)
A,
9
10
-
3
7
+
1
10

=
33
70
+
1
10

=
4
7


9
10
+
1
10
-
3
7

=1-
3
7

=
4
7

两个算式的运算结果相等,等式成立;

B,
7
8
÷
2
5
×
8
7

=
35
16
×
8
7

=
5
2


7
8
×
8
7
÷
2
5

=1÷
2
5

=
5
2

两个算式的运算结果相等,等式成立;

C,
1
4
+
3
4
÷
2
3
+
1
3

=
1
4
+
9
8
+
1
3

=
11
8
+
1
3

=
41
24


1
4
+
3
4
)÷(
2
3
+
1
3
),
=1÷1,
=1;
41
24
≠1;两个算式的运算结果不相等,等式不成立;
故选:C.
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