脱式计算,能简算的要简算.23÷8+18×1312-512-11237×(45-23)÷2151930×31-1930.-数学

题目简介

脱式计算,能简算的要简算.23÷8+18×1312-512-11237×(45-23)÷2151930×31-1930.-数学

题目详情

脱式计算,能简算的要简算.
2
3
÷8+
1
8
×
1
3
1
2
-
5
12
-
1
12
3
7
×(
4
5
-
2
3
)÷
2
15
19
30
×31-
19
30
题型:解答题难度:中档来源:不详

答案

(1)class="stub"2
3
÷8+class="stub"1
8
×class="stub"1
3

=class="stub"2
3
×class="stub"1
8
+class="stub"1
8
×class="stub"1
3

=class="stub"1
8
×(class="stub"2
3
+class="stub"1
3
),
=class="stub"1
8
×1,
=class="stub"1
8


(2)class="stub"1
2
-class="stub"5
12
-class="stub"1
12

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

=0;

(3)class="stub"3
7
×(class="stub"4
5
-class="stub"2
3
)÷class="stub"2
15

=class="stub"3
7
×class="stub"2
15
×class="stub"15
2

=class="stub"3
7


(4)class="stub"19
30
×31-class="stub"19
30

=class="stub"19
30
×(31-1),
=class="stub"19
30
×30,
=19.

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