用递等式计算.(可用简便算法)5710×310+310×31023+(47+12)×725813÷7+17×613813÷7+17×713(112+12-712)÷17115÷0.24-1.6×34.

题目简介

用递等式计算.(可用简便算法)5710×310+310×31023+(47+12)×725813÷7+17×613813÷7+17×713(112+12-712)÷17115÷0.24-1.6×34.

题目详情

用递等式计算.(可用简便算法)
57
10
×
3
10
+
3
10
×
3
10

2
3
+(
4
7
+
1
2
)×
7
25

8
13
÷7+
1
7
×
6
13

8
13
÷7+
1
7
×
7
13

1
12
+
1
2
-
7
12
)÷
1
7

1
1
5
÷0.24-1.6×
3
4
题型:解答题难度:中档来源:不详

答案

(1)class="stub"57
10
×class="stub"3
10
+class="stub"3
10
×class="stub"3
10

=(class="stub"57
10
+class="stub"3
10
)×class="stub"3
10

=6×class="stub"3
10

=class="stub"9
5


(2)class="stub"2
3
+(class="stub"4
7
+class="stub"1
2
)×class="stub"7
25

=class="stub"2
3
+class="stub"15
14
×class="stub"7
25

=class="stub"2
3
+class="stub"3
10

=class="stub"29
30


(3)class="stub"8
13
÷7+class="stub"1
7
×class="stub"6
13

=class="stub"8
13
×class="stub"1
7
+class="stub"1
7
×class="stub"6
13

=(class="stub"8
13
+class="stub"6
13
)×class="stub"1
7

=class="stub"14
13
×class="stub"1
7

=class="stub"2
13


(4)class="stub"8
13
÷7+class="stub"1
7
×class="stub"7
13

=class="stub"8
13
×class="stub"1
7
+class="stub"1
7
×class="stub"7
13

=(class="stub"8
13
+class="stub"7
13
)×class="stub"1
7

=class="stub"15
13
×class="stub"1
7

=class="stub"15
91


(5)(class="stub"1
12
+class="stub"1
2
-class="stub"7
12
)÷class="stub"1
7

=(class="stub"7
12
-class="stub"7
12
)÷class="stub"1
7

=0÷class="stub"1
7

=0;

(6)1class="stub"1
5
÷0.24-1.6×class="stub"3
4

=5-1.2,
=3.8.

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