用簡便方法計算下面各題25 1 25

2021-03-19 18:38:00 字數 3273 閱讀 2136

1樓:小豪訊償

(1)25×1.25×32,

=25×1.25×4×8,

=(25×4)×(1.25×8),

=100×10,

=1000;

(2)73.8×16-7.38×60,

=7.38×160-7.38×60,

=7.38×(160-60);

=7.38×100,

=738;

(3)1.25+5 4

×0.4+125%÷5 8

,=1.25+1.25×0.4+1.25×1.6,=1.25×(1+0.4+1.6),

=1.25×3,

=3.75.

用簡便方法計算下列各題 25×(40×32); (5×7)×80; 8×14×125×6; 16×25×5×4; 25×

2樓:是大可愛啦

(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

×613

+3 7

×613

=(4 7

+3 7

)×613

=1×6

13 =613

計算下列各題,能簡算的用簡便方法計算.26-3.17-7.83 67×38+33×38 125×25×64 29.38-(19.38-4.76)

3樓:ayの0077e薩

(1)26-3.17-7.83,

=26-(3.17+7.83),

=26-11,

=15;

(2)67×38+33×38,

=(67+33)×38,

=100×38,

=3800;

(3)125×25×64,

=125×25×4×8,

=(125×8)×(25×4),

=1000×100,

=100000;

(4)29.38-(19.38-4.76),=29.38-19.38+4.76,

=10+4.76,

=14.76;

(5)329×87-87×29,

=(329-29)×87,

=300×87,

=26100;

(6)5.8-3.62-0.38+0.2,=(5.8+0.2)-(3.62+0.38),=6-4,=2.

用簡便方法計算下面各題。0.7×0.4×2.5 8.4×0.25 2.5×6.7×0.8

4樓:瓦片

0.7*0.4*2.

5=0.7*1=0.78.

4*0.25=2.1*4*0.

25=2.1*1=2.12.

5*6.7*0.8=2.

5*4*0.2*6.7=10*0.

2*6.72*6.7=13.

436*10.1=36*(10+0.1)=36+3.

6=39.60.68*98=0.

68*(100-2)=68-1.37=66.632.

8*3.7+1.3*2.

8=2.8*(3.7+1.

3)=2.8*5=14

8.2*9.9=8.2*(10-0.1)=82-8.2=73.87.24-2.29-3.7=1.25

3.2*1.25*25=(8*1.25)*(0.4*25)=10*10=100

5樓:匿名使用者

0.7×

0.4×2.5=0.7×(0.4×2.5)=0.7×1=0.7

8.4×0.25=8×0.25+0.4×0.25=2+0.1=2.1

2.5×6.7×0.8=6.7×(專2.5×0.8)=6.7×2=13.4

36×10.1=36×10+36×0.1=360+3.6=363.6

0.68×98=0.68×(100-2)=0.68×100-0.68×2=68-1.36=66.64

2.8×3.7+1.3×2.8=2.8×(3.7+1.3)=2.8×5=14

8.2×9.9=8.2×(10-0.1)=8.2×10-8.2×0.1=82-0.82=81.18

7.24-2.29-3.

7=(7.24+0.01)-(0.

01+2.29)-3.7=7.

25-2.3-3.7=7.

25-(2.3+3.7)=7.

25-6=1.25

3.2×1.25×25=(4×0.8)×屬1.25×25=4×25×0.8×1.25=100×1=100

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