计算下列各题,能简算的要简算.(1)45+(38-14)(2)2-37-47(3)58-13+512(4)38.7-7.84÷1.4(5)512-(112-12)(6)8.8-2.5×1.8.-数学

题目简介

计算下列各题,能简算的要简算.(1)45+(38-14)(2)2-37-47(3)58-13+512(4)38.7-7.84÷1.4(5)512-(112-12)(6)8.8-2.5×1.8.-数学

题目详情

计算下列各题,能简算的要简算.
(1)
4
5
+(
3
8
-
1
4

(2)2-
3
7
-
4
7

(3)
5
8
-
1
3
+
5
12

(4)38.7-7.84÷1.4
(5)
5
12
-(
1
12
-
1
2

(6)8.8-2.5×1.8.
题型:解答题难度:中档来源:不详

答案

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

=class="stub"32
40
+class="stub"5
40

=class="stub"37
40


(2)2-class="stub"3
7
-class="stub"4
7

=2-(class="stub"3
7
+class="stub"4
7
),
=2-1,
=1;

(3)class="stub"5
8
-class="stub"1
3
+class="stub"5
12

=class="stub"15
24
-class="stub"8
24
+class="stub"10
24

=class="stub"7
24
+class="stub"10
24

=class="stub"17
24


(4)38.7-7.84÷1.4,
=38.7-5.6,
=33.1;

(5)class="stub"5
12
-(class="stub"1
12
-class="stub"1
2
),
=class="stub"5
12
-(class="stub"1
12
-class="stub"6
12
),
=class="stub"5
12
-(-class="stub"5
12
),
=class="stub"5
12
+class="stub"5
12

=class="stub"10
12

=class="stub"5
6


(6)8.8-2.5×1.8,
=8.8-4.5,
=4.3.

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