问题 解答题
用简便方法计算下列各题
25×(40×32);(5×7)×80;8×14×125×6;16×25×5×4;25×13×4;
2843-598;4×8×25×125;259+468+741+532;36×25;12×15+12×35;
31×128-28×31;(25+250)×4;(125×125)×8;
7
12
-
1
5
)×60;
4
7
×
6
13
+
3
7
×
6
13
答案

(1)25×(40×32)

=(25×40)×32

=1000×32

=32000

(2)(5×7)×80

=(5×80)×7

=400×7

=2800

(3)8×14×125×6

=(8×125)×(14×6)

=1000×84

=84000

(4)16×25×5×4

=(16×5)×(25×4)

=90×100

=9000

(5)25×13×4

=(25×4)×13

=100×13

=1300

(6)2843-598

=2843-(600-2)

=2843-600+2

=2245

(7)4×8×25×125

=(4×25)×(8×125)

=100×1000

=100000

(8)259+468+741+532

=(259+741)+(468+532)

=1000+1000

=2000

(9)36×25

=9×4×25

=9×(4×25)

=9×100

=900

(10)12×15+12×35

=12×(15+35)

=12×50

=600

(11)31×128-28×31

=31×(128-28)

=31×100

=3100

(12)(25+250)×4

=25×4+250×4

=100+1000

=1100

(13)(125×125)×8

=125×(125×8)

=125×1000

=125000

(14)(

7
12
-
1
5
)×60

=60×

7
12
-
1
5
×60

=35-12

=23

(15)

4
7
×
6
13
+
3
7
×
6
13

=(

4
7
+
3
7
)×
6
13

=1×

6
13

=

6
13

单项选择题
单项选择题