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计算下面各题.(1)75+25×12=(2)64×128÷(32×64)=(3)72×(13-12+34)=(4)14÷(11-813-513)=(5)23×1324+1324=(6)2.2-8÷11-211×7=(7)1012+(812-537)=(8)856-(756-316)=
题目详情
计算下面各题. (1)75+25×12= | (2)64×128÷(32×64)= | ||||||||||||||||||||
(3)72×(
| (4)
| ||||||||||||||||||||
(5)23×
| (6)2.2-8÷11-
| ||||||||||||||||||||
(7)10
| (8)8
| ||||||||||||||||||||
(9)(
| (10)1
| ||||||||||||||||||||
(11)20÷[
| (12)1
| ||||||||||||||||||||
(13)(2.5×4.8)×
| (14)15
| ||||||||||||||||||||
(15)3333×6666+9999×7778= | (16)357×256256-356×255255 | ||||||||||||||||||||
(17)1
| (18)
| ||||||||||||||||||||
(19)
| (20)1
|
▼优质解答
答案和解析
(1)75+25×12
=75+300
=375;
(2)64×128÷(32×64)
=64×128÷32÷64
=(64÷64)×(128÷32)
=1×4
=4;
(3)72×(
-
+
)
=72×
-72×
+72×
=24-36+54
=24+54-36
=78-36
=42;
(4)
÷(11-
-
)
=
÷[11-(
+
)]
=
÷[11-1]
=
÷10
=
;
(5)23×
+
=(23+1)×
=24×
=13;
(6)2.2-8÷11-
×7
=2.2-
-
=2.2-(
+
)
=2.2-2
=0.2;
(7)10
+(8
-5
)
=(10
+8
)-5
=19-5
=13
;
(8)8
-(7
-3
)
=8
-7
+3
=1+3
=4
;
(9)(
+
)×7+
=
×7+
×7+
=5+
+
=5+(
=75+300
=375;
(2)64×128÷(32×64)
=64×128÷32÷64
=(64÷64)×(128÷32)
=1×4
=4;
(3)72×(
1 |
3 |
1 |
2 |
3 |
4 |
=72×
1 |
3 |
1 |
2 |
3 |
4 |
=24-36+54
=24+54-36
=78-36
=42;
(4)
1 |
4 |
8 |
13 |
5 |
13 |
=
1 |
4 |
8 |
13 |
5 |
13 |
=
1 |
4 |
=
1 |
4 |
=
1 |
40 |
(5)23×
13 |
24 |
13 |
24 |
=(23+1)×
13 |
24 |
=24×
13 |
24 |
=13;
(6)2.2-8÷11-
2 |
11 |
=2.2-
8 |
11 |
14 |
11 |
=2.2-(
8 |
11 |
14 |
11 |
=2.2-2
=0.2;
(7)10
1 |
2 |
1 |
2 |
3 |
7 |
=(10
1 |
2 |
1 |
2 |
3 |
7 |
=19-5
3 |
7 |
=13
4 |
7 |
(8)8
5 |
6 |
5 |
6 |
1 |
6 |
=8
5 |
6 |
5 |
6 |
1 |
6 |
=1+3
1 |
6 |
=4
1 |
6 |
(9)(
5 |
7 |
1 |
15 |
8 |
15 |
=
5 |
7 |
1 |
15 |
8 |
15 |
=5+
7 |
15 |
8 |
15 |
=5+(
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