用合适的方法计算.12÷54÷2155.2-11÷7-17×357×14+34÷7558÷(12+14)(14+16-13)÷11257÷[1÷(23-15)].-数学

题目简介

用合适的方法计算.12÷54÷2155.2-11÷7-17×357×14+34÷7558÷(12+14)(14+16-13)÷11257÷[1÷(23-15)].-数学

题目详情

用合适的方法计算.
1
2
÷
5
4
÷
2
15
5.2-11÷7-
1
7
×3
5
7
×
1
4
+
3
4
÷
7
5
5
8
÷(
1
2
+
1
4
1
4
+
1
6
-
1
3
)÷
1
12
5
7
÷[1÷(
2
3
-
1
5
)].
题型:解答题难度:中档来源:不详

答案

(1)class="stub"1
2
÷class="stub"5
4
÷class="stub"2
15

=class="stub"1
2
×class="stub"4
5
×class="stub"15
2

=class="stub"2
5
×class="stub"15
2

=3;

(2)5.2-11÷7-class="stub"1
7
×3,
=5.2-class="stub"11
7
-class="stub"3
7

=5.2-(class="stub"11
7
+class="stub"3
7
),
=5.2-2,
=3.2;

(3)class="stub"5
7
×class="stub"1
4
+class="stub"3
4
÷class="stub"7
5

=class="stub"5
7
×class="stub"1
4
+class="stub"3
4
×class="stub"5
7

=class="stub"5
7
×(class="stub"1
4
+class="stub"3
4
),
=class="stub"5
7
×1,
=class="stub"5
7


(4)class="stub"5
8
÷(class="stub"1
2
+class="stub"1
4
),
=class="stub"5
8
÷class="stub"3
4

=class="stub"5
6


(5)(class="stub"1
4
+class="stub"1
6
-class="stub"1
3
)÷class="stub"1
12

=(class="stub"1
4
+class="stub"1
6
-class="stub"1
3
)×12,
=class="stub"1
4
×12+class="stub"1
6
×12-class="stub"1
3
×12,
=3+2-4,
=1;

(6)class="stub"5
7
÷[1÷(class="stub"2
3
-class="stub"1
5
)],
=class="stub"5
7
÷[1÷class="stub"7
15
],
=class="stub"5
7
÷class="stub"15
7

=class="stub"1
3

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