下面等式不成立的是()A.910-37+110=910+110-37B.78÷25×87=78×87÷25C.14+34÷23+13=(14+34)÷(23+13)-数学

题目简介

下面等式不成立的是()A.910-37+110=910+110-37B.78÷25×87=78×87÷25C.14+34÷23+13=(14+34)÷(23+13)-数学

题目详情

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
)
题型:单选题难度:偏易来源:不详

答案

A,class="stub"9
10
-class="stub"3
7
+class="stub"1
10

=class="stub"33
70
+class="stub"1
10

=class="stub"4
7


class="stub"9
10
+class="stub"1
10
-class="stub"3
7

=1-class="stub"3
7

=class="stub"4
7

两个算式的运算结果相等,等式成立;

B,class="stub"7
8
÷class="stub"2
5
×class="stub"8
7

=class="stub"35
16
×class="stub"8
7

=class="stub"5
2


class="stub"7
8
×class="stub"8
7
÷class="stub"2
5

=1÷class="stub"2
5

=class="stub"5
2

两个算式的运算结果相等,等式成立;

C,class="stub"1
4
+class="stub"3
4
÷class="stub"2
3
+class="stub"1
3

=class="stub"1
4
+class="stub"9
8
+class="stub"1
3

=class="stub"11
8
+class="stub"1
3

=class="stub"41
24


class="stub"1
4
+class="stub"3
4
)÷(class="stub"2
3
+class="stub"1
3
),
=1÷1,
=1;
class="stub"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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