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计算.(能简算的要用简便方法计算)7112-2143215+4893.75+52714-258-5382710-137+2.3113-0.5+2112625-(0.15+423)5.25-(114+3813)212-(7.05-6920)212-(0.75+720)4.125+257-257+578.

题目详情
计算.(能简算的要用简便方法计算)
7
1
12
-2
1
4
3
2
15
+4
8
9
3.75+5
2
7
14-2
5
8
-5
3
8
2
7
10
-1
3
7
+2.3
1
1
3
-0.5+2
1
12
6
2
5
-(0.15+4
2
3
5.25-(1
1
4
+3
8
13
2
1
2
-(7.05-6
9
20
2
1
2
-(0.75+
7
20
4.125+2
5
7
-2
5
7
+5
7
8
▼优质解答
答案和解析
(1)7
1
12
-2
1
4
=4
5
6


(2)3
2
15
+4
8
9
=8
1
45


(3)3.75+5
2
7
=9
1
28


(4)14-2
5
8
-5
3
8

=14-(2
5
8
+5
3
8

=14-8
=6;

(5)2
7
10
-1
3
7
+2.3
=2
7
10
+2.3-1
3
7

=5-1
3
7

=3
4
7


(6)1
1
3
-0.5+2
1
12

=
5
6
+2
1
12

=2
11
12


(7)6
2
5
-(0.15+4
2
3

=6
2
5
-0.15-4
2
3

=6.25-4
2
3

=1
7
12


(8)5.25-(1
1
4
+3
8
13

=5.25-1
1
4
-3
8
13

=4-3
8
13

=
5
13


(9)2
1
2
-(7.05-6
9
20

=2
1
2
-0.6
=1.9;

(10)2
1
2
-(0.75+
7
20

=2
1
2
-1.1
=1.4;

(11)4.125+2
5
7
-2
5
7
+5
7
8

=(4.125+5
7
8
)+(2
5
7
-2
5
7

=10+0
=10.