用简便方法计算:14+(23+34)14+13+14+2359-45-1597+18+38+57.-数学

题目简介

用简便方法计算:14+(23+34)14+13+14+2359-45-1597+18+38+57.-数学

题目详情

用简便方法计算:
1
4
+(
2
3
+
3
4
1
4
+
1
3
+
1
4
+
2
3
5
9
-
4
5
-
1
5
9
7
+
1
8
+
3
8
+
5
7
题型:解答题难度:中档来源:不详

答案

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

=1+class="stub"2
3

=1class="stub"2
3


(2)class="stub"1
4
+class="stub"1
3
+class="stub"1
4
+class="stub"2
3

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


(3)class="stub"5
9
-class="stub"4
5
-class="stub"1
5

=class="stub"5
9
-(class="stub"4
5
+class="stub"1
5
),
=class="stub"5
9
-1,
=-class="stub"4
9


(4)class="stub"9
7
+class="stub"1
8
+class="stub"3
8
+class="stub"5
7

=class="stub"9
7
+class="stub"5
7
+(class="stub"1
8
+class="stub"3
8
),
=2+class="stub"1
2

=2class="stub"1
2

更多内容推荐