计算(能简算的要简算,写出计算过程)(1)53÷45-54×23(2)[447-(345-223)×157]÷1415(3)12922÷612×[247+(24.4-24845)](4)2+416+6

题目简介

计算(能简算的要简算,写出计算过程)(1)53÷45-54×23(2)[447-(345-223)×157]÷1415(3)12922÷612×[247+(24.4-24845)](4)2+416+6

题目详情

计算(能简算的要简算,写出计算过程)
(1)
5
3
÷
4
5
-
5
4
×
2
3

(2)[4
4
7
-(3
4
5
-2
2
3
15
7
14
15

(3)12
9
22
÷6
1
2
×[2
4
7
+(24.4-24
8
45
)]

(4)2+4
1
6
+6
1
12
+8
1
20
+10
1
30
+12
1
42

(5)12345678912-1234567890×1234567892
(6)
1
3
+
1
15
+
1
35
+
1
63
+…+
1
399
题型:解答题难度:中档来源:不详

答案


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

=
class="stub"5
3
×class="stub"5
4
-class="stub"5
4
×class="stub"2
3

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

=1×class="stub"5
4

=class="stub"5
4


(2)[4class="stub"4
7
-(3class="stub"4
5
-2class="stub"2
3
)×class="stub"15
7
]÷class="stub"14
15

=[4class="stub"4
7
-(class="stub"19
5
-class="stub"8
3
)×class="stub"15
7
]÷class="stub"14
15

=[4class="stub"4
7
-(class="stub"19
5
×class="stub"15
7
-class="stub"8
3
×class="stub"15
7
)]÷class="stub"14
15

=[class="stub"32
7
-(class="stub"57
7
-class="stub"40
7
)]÷class="stub"14
15

=[class="stub"32
7
-class="stub"17
7
]÷class="stub"14
15

=class="stub"15
7
×class="stub"15
14

=class="stub"225
98


(3)12class="stub"9
22
÷6class="stub"1
2
×[2class="stub"4
7
+(24.4-24class="stub"8
45
)]

=12class="stub"9
22
÷6class="stub"1
2
×[2class="stub"4
7
+class="stub"2
9
]

=class="stub"273
22
×class="stub"2
13
×class="stub"176
63

=class="stub"16
3


(4)2+4class="stub"1
6
+6class="stub"1
12
+8class="stub"1
20
+10class="stub"1
30
+12class="stub"1
42

=(2+4+6+8+10+12)+(
class="stub"1
6
+class="stub"1
12
+class="stub"1
20
+class="stub"1
30
+class="stub"1
42

=(2+12)×6÷2+(
class="stub"1
2×3
+class="stub"1
3×4
+class="stub"1
4×5
+class="stub"1
5×6
+class="stub"1
6×7
),
=42+(class="stub"1
2
-class="stub"1
3
+class="stub"1
3
-class="stub"1
4
+class="stub"1
4
-class="stub"1
5
+class="stub"1
5
-class="stub"1
6
+class="stub"1
6
-class="stub"1
7
),
=42+(class="stub"1
2
-class="stub"1
7
),
=42+class="stub"5
14

=42class="stub"5
14


(5)12345678912-1234567890×1234567892,
=12345678912-(1234567891-1)(1234567891+1),
=12345678912-(12345678912-1),
=12345678912-12345678912+1,
=1;

(6)class="stub"1
3
+class="stub"1
15
+class="stub"1
35
+class="stub"1
63
+…+class="stub"1
399

=
class="stub"1
1×3
+class="stub"1
3×5
+class="stub"1
5×7
+class="stub"1
7×9
+…+class="stub"1
19×21
 

=
class="stub"1
2
×(1-class="stub"1
3
+class="stub"1
3
-class="stub"1
5
+class="stub"1
5
-class="stub"1
7
+class="stub"1
7
-class="stub"1
9
+…+class="stub"1
19
-class="stub"1
21
)

=class="stub"1
2
×(1-class="stub"1
21
),
=class="stub"1
2
×class="stub"20
21

=class="stub"10
21

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